Errors/Django

Common Django Errors

Django errors including ORM exceptions, migration issues, template errors, URL routing, and deployment problems.

100 errors documented with step-by-step fixes

Object DoesNotExist Django

DoesNotExist

The query returned no results when exactly one was expected.

Multiple objects returned Django

MultipleObjectsReturned

The get() query matched more than one object.

Duplicate key IntegrityError Django

IntegrityError: duplicate key

You tried to create a record that violates a unique constraint.

NOT NULL constraint failed Django

IntegrityError: NOT NULL constraint

A required field was left empty.

Cannot resolve keyword Django

FieldError: Cannot resolve keyword

You used a field name that doesn't exist on the model.

No such table Django

OperationalError: no such table

The database table doesn't exist, usually because migrations haven't been run.

No such column Django

OperationalError: no such column

A model field was added but migrations weren't created/applied.

Relation does not exist Django PostgreSQL

ProgrammingError: relation does not exist

The PostgreSQL table hasn't been created yet.

You have unapplied migrations Django

PendingMigrationError

There are migrations that haven't been applied to the database.

Inconsistent migration history Django

InconsistentMigrationHistory

The migration history in the database doesn't match the migration files.

Template syntax error Django

TemplateSyntaxError

The template has invalid syntax like unclosed tags or wrong filter usage.

Template does not exist Django

TemplateDoesNotExist

Django can't find the template file.

No reverse match Django URL

NoReverseMatch

Django can't find a URL pattern matching the name and arguments.

Page not found 404 Django

Resolver404

No URL pattern matches the requested path.

Validation error Django form

ValidationError

Form or model validation failed.

CSRF token missing or incorrect Django

CSRF verification failed

The POST request is missing or has an invalid CSRF token.

Permission denied 403 Django

PermissionDenied

The user doesn't have permission for this action.

Improperly configured Django settings

ImproperlyConfigured

A Django setting is missing or incorrect.

Invalid HTTP_HOST header Django

DisallowedHost

The request's Host header isn't in ALLOWED_HOSTS.

Field does not exist Django

FieldDoesNotExist

You referenced a model field that doesn't exist.

Object does not exist Django generic

ObjectDoesNotExist

Generic version of DoesNotExist for any model.

Current transaction is aborted Django

DatabaseError: current transaction is aborted

A previous database error wasn't handled, poisoning the transaction.

N+1 query problem Django ORM

N+1 query problem

Each loop iteration triggers a separate database query.

Max length exceeded Django

MaxLengthValidator

The field value exceeds the max_length constraint.

Related object does not exist Django

RelatedObjectDoesNotExist

Accessing a reverse ForeignKey or OneToOneField that doesn't have a related object.

Migration schema missing Django

MigrationSchemaMissing

The django_migrations table doesn't exist.

Static file not found Django

staticfiles.finders.FileSystemFinder

Django can't find the static file.

Database connection refused Django

ConnectionRefusedError database

Django can't connect to the database server.

Suspicious operation Django

SuspiciousOperation

Django detected a potentially malicious request.

Apps not loaded yet Django

RuntimeError: apps aren't loaded yet

You tried to use Django models before django.setup() was called.

FieldInvalid field name for model in Django

FieldError: Invalid field name for model

This Django error occurs when invalid field name for model. Check the stack trace for the exact location and fix the root cause.

FieldUnsupported lookup for CharField in Django

FieldError: Unsupported lookup for CharField

This Django error occurs when unsupported lookup for charfield. Check the stack trace for the exact location and fix the root cause.

ValueCannot alter field because it is not concrete in Django

ValueError: Cannot alter field because it is not concrete

This Django error occurs when cannot alter field because it is not concrete. Check the stack trace for the exact location and fix the root cause.

TypeDirect assignment to the forward side of a many-to-many in Django

TypeError: Direct assignment to the forward side of a many-to-many set

This Django error occurs when direct assignment to the forward side of a many-to-many set. Check the stack trace for the exact location and fix the root cause.

ValueCannot assign: instance is on database default in Django

ValueError: Cannot assign: instance is on database default

This Django error occurs when instance is on database default. Check the stack trace for the exact location and fix the root cause.

ObjectDoesNotExist vs DoesNotExist in Django

ObjectDoesNotExist vs DoesNotExist

This Django error occurs when an unexpected condition is encountered. Check the stack trace for the exact location and fix the root cause.

TransactionManagementcannot perform this operation in Django

TransactionManagementError: cannot perform this operation

This Django error occurs when cannot perform this operation. Check the stack trace for the exact location and fix the root cause.

OperationalFATAL: too many connections in Django

OperationalError: FATAL: too many connections

This Django error occurs when too many connections. Check the stack trace for the exact location and fix the root cause.

OperationalSSL connection required in Django

OperationalError: SSL connection required

This Django error occurs when ssl connection required. Check the stack trace for the exact location and fix the root cause.

Interfaceconnection already closed in Django

InterfaceError: connection already closed

This Django error occurs when connection already closed. Check the stack trace for the exact location and fix the root cause.

Datavalue too long for type in Django

DataError: value too long for type

This Django error occurs when value too long for type. Check the stack trace for the exact location and fix the root cause.

Programmingcolumn is of type integer but expression is of ty in Django

ProgrammingError: column is of type integer but expression is of type text

This Django error occurs when column is of type integer but expression is of type text. Check the stack trace for the exact location and fix the root cause.

django.db.utils.NotSupportedError in Django

django.db.utils.NotSupportedError

This Django error occurs when an unexpected condition is encountered. Check the stack trace for the exact location and fix the root cause.

MigrationSchemaMissing table django_migrations in Django

MigrationSchemaMissing table django_migrations

This Django error occurs when an unexpected condition is encountered. Check the stack trace for the exact location and fix the root cause.

InvalidBasesCannot resolve bases for model in Django

InvalidBasesError: Cannot resolve bases for model

This Django error occurs when cannot resolve bases for model. Check the stack trace for the exact location and fix the root cause.

CircularDependencyError in migrations in Django

CircularDependencyError in migrations

This Django error occurs when an unexpected condition is encountered. Check the stack trace for the exact location and fix the root cause.

Ambiguityname matches multiple fields in Django

AmbiguityError: name matches multiple fields

This Django error occurs when name matches multiple fields. Check the stack trace for the exact location and fix the root cause.

TemplateSyntaxCould not parse the remainder in Django

TemplateSyntaxError: Could not parse the remainder

This Django error occurs when could not parse the remainder. Check the stack trace for the exact location and fix the root cause.

TemplateSyntaxInvalid block tag in Django

TemplateSyntaxError: Invalid block tag

This Django error occurs when invalid block tag. Check the stack trace for the exact location and fix the root cause.

VariableDoesNotExist in template in Django

VariableDoesNotExist in template

This Django error occurs when an unexpected condition is encountered. Check the stack trace for the exact location and fix the root cause.

NoReverseMatch with namespace in Django

NoReverseMatch with namespace

This Django error occurs when an unexpected condition is encountered. Check the stack trace for the exact location and fix the root cause.

Resolver404 with query parameters in Django

Resolver404 with query parameters

This Django error occurs when an unexpected condition is encountered. Check the stack trace for the exact location and fix the root cause.

Http404 raised explicitly in Django

Http404 raised explicitly

This Django error occurs when an unexpected condition is encountered. Check the stack trace for the exact location and fix the root cause.

SuspiciousFileOperation: joined path is outside base in Django

SuspiciousFileOperation: joined path is outside base

This Django error occurs when joined path is outside base. Check the stack trace for the exact location and fix the root cause.

SuspiciousMultipartForm in Django

SuspiciousMultipartForm

This Django error occurs when an unexpected condition is encountered. Check the stack trace for the exact location and fix the root cause.

RequestDataTooBig in Django

RequestDataTooBig

This Django error occurs when an unexpected condition is encountered. Check the stack trace for the exact location and fix the root cause.

TooManyFieldsSent in Django

TooManyFieldsSent

This Django error occurs when an unexpected condition is encountered. Check the stack trace for the exact location and fix the root cause.

BadRequest: Invalid cookie in Django

BadRequest: Invalid cookie

This Django error occurs when invalid cookie. Check the stack trace for the exact location and fix the root cause.

PermissionDenied in middleware in Django

PermissionDenied in middleware

This Django error occurs when an unexpected condition is encountered. Check the stack trace for the exact location and fix the root cause.

MiddlewareNotUsed in Django

MiddlewareNotUsed

This Django error occurs when an unexpected condition is encountered. Check the stack trace for the exact location and fix the root cause.

Commandmanage.py command failed in Django

CommandError: manage.py command failed

This Django error occurs when manage.py command failed. Check the stack trace for the exact location and fix the root cause.

AppRegistryNotReady in Django

AppRegistryNotReady

This Django error occurs when an unexpected condition is encountered. Check the stack trace for the exact location and fix the root cause.

LookupNo installed app with label in Django

LookupError: No installed app with label

This Django error occurs when no installed app with label. Check the stack trace for the exact location and fix the root cause.

ContentTypeManager table missing in Django

ContentTypeManager table missing

This Django error occurs when an unexpected condition is encountered. Check the stack trace for the exact location and fix the root cause.

Site matching query does not exist in Django

Site matching query does not exist

This Django error occurs when an unexpected condition is encountered. Check the stack trace for the exact location and fix the root cause.

TypeObject of type QuerySet is not JSON serializable in Django

TypeError: Object of type QuerySet is not JSON serializable

This Django error occurs when object of type queryset is not json serializable. Check the stack trace for the exact location and fix the root cause.

UnicodeDecodeError in file upload in Django

UnicodeDecodeError in file upload

This Django error occurs when an unexpected condition is encountered. Check the stack trace for the exact location and fix the root cause.

InMemoryUploadedFile error in Django

InMemoryUploadedFile error

This Django error occurs when an unexpected condition is encountered. Check the stack trace for the exact location and fix the root cause.

SuspiciousOperation: Content-Type header missing in Django

SuspiciousOperation: Content-Type header missing

This Django error occurs when content-type header missing. Check the stack trace for the exact location and fix the root cause.

CacheKeykey length exceeded in Django

CacheKeyWarning: key length exceeded

This Django error occurs when key length exceeded. Check the stack trace for the exact location and fix the root cause.

ConnectionRedis cache unavailable in Django

ConnectionError: Redis cache unavailable

This Django error occurs when redis cache unavailable. Check the stack trace for the exact location and fix the root cause.

MemcachedKeyLengthError in Django

MemcachedKeyLengthError

This Django error occurs when an unexpected condition is encountered. Check the stack trace for the exact location and fix the root cause.

EmailMessage encoding error in Django

EmailMessage encoding error

This Django error occurs when an unexpected condition is encountered. Check the stack trace for the exact location and fix the root cause.

SMTPData550 relay not permitted in Django

SMTPDataError: 550 relay not permitted

This Django error occurs when 550 relay not permitted. Check the stack trace for the exact location and fix the root cause.

celery.exceptions.NotRegistered in Django

celery.exceptions.NotRegistered

This Django error occurs when an unexpected condition is encountered. Check the stack trace for the exact location and fix the root cause.

social_core.exceptions.AuthAlreadyAssociated in Django

social_core.exceptions.AuthAlreadyAssociated

This Django error occurs when an unexpected condition is encountered. Check the stack trace for the exact location and fix the root cause.

rest_framework.exceptions.NotAuthenticated in Django

rest_framework.exceptions.NotAuthenticated

This Django error occurs when an unexpected condition is encountered. Check the stack trace for the exact location and fix the root cause.

rest_framework.exceptions.Throttled in Django

rest_framework.exceptions.Throttled

This Django error occurs when an unexpected condition is encountered. Check the stack trace for the exact location and fix the root cause.

rest_framework.exceptions.ParseError in Django

rest_framework.exceptions.ParseError

This Django error occurs when an unexpected condition is encountered. Check the stack trace for the exact location and fix the root cause.

rest_framework.exceptions.UnsupportedMediaType in Django

rest_framework.exceptions.UnsupportedMediaType

This Django error occurs when an unexpected condition is encountered. Check the stack trace for the exact location and fix the root cause.

rest_framework serializer ListSerializer error in Django

rest_framework serializer ListSerializer error

This Django error occurs when an unexpected condition is encountered. Check the stack trace for the exact location and fix the root cause.

rest_framework.renderers.JSONRenderer error in Django

rest_framework.renderers.JSONRenderer error

This Django error occurs when an unexpected condition is encountered. Check the stack trace for the exact location and fix the root cause.

rest_framework.pagination error in Django

rest_framework.pagination error

This Django error occurs when an unexpected condition is encountered. Check the stack trace for the exact location and fix the root cause.

rest_framework.permissions.IsAuthenticated denied in Django

rest_framework.permissions.IsAuthenticated denied

This Django error occurs when an unexpected condition is encountered. Check the stack trace for the exact location and fix the root cause.

rest_framework HyperlinkedModelSerializer error in Django

rest_framework HyperlinkedModelSerializer error

This Django error occurs when an unexpected condition is encountered. Check the stack trace for the exact location and fix the root cause.

channels.exceptions.DenyConnection in Django

channels.exceptions.DenyConnection

This Django error occurs when an unexpected condition is encountered. Check the stack trace for the exact location and fix the root cause.

channels WebSocket routing error in Django

channels WebSocket routing error

This Django error occurs when an unexpected condition is encountered. Check the stack trace for the exact location and fix the root cause.

django-cors-headers misconfigured in Django

django-cors-headers misconfigured

This Django error occurs when an unexpected condition is encountered. Check the stack trace for the exact location and fix the root cause.

django-debug-toolbar import error in Django

django-debug-toolbar import error

This Django error occurs when an unexpected condition is encountered. Check the stack trace for the exact location and fix the root cause.

django-extensions RunServerPlus error in Django

django-extensions RunServerPlus error

This Django error occurs when an unexpected condition is encountered. Check the stack trace for the exact location and fix the root cause.

django-filter FieldError in Django

django-filter FieldError

This Django error occurs when an unexpected condition is encountered. Check the stack trace for the exact location and fix the root cause.

django-allauth callback error in Django

django-allauth callback error

This Django error occurs when an unexpected condition is encountered. Check the stack trace for the exact location and fix the root cause.

django-celery-beat PeriodicTask error in Django

django-celery-beat PeriodicTask error

This Django error occurs when an unexpected condition is encountered. Check the stack trace for the exact location and fix the root cause.

whitenoise FileNotFoundError in Django

whitenoise FileNotFoundError

This Django error occurs when an unexpected condition is encountered. Check the stack trace for the exact location and fix the root cause.

Gunicorn worker timeout in Django

Gunicorn worker timeout

This Django error occurs when an unexpected condition is encountered. Check the stack trace for the exact location and fix the root cause.

Gunicorn max-requests reload error in Django

Gunicorn max-requests reload error

This Django error occurs when an unexpected condition is encountered. Check the stack trace for the exact location and fix the root cause.

uWSGI import error in Django

uWSGI import error

This Django error occurs when an unexpected condition is encountered. Check the stack trace for the exact location and fix the root cause.

collectstatic ManifestStaticFilesStorage error in Django

collectstatic ManifestStaticFilesStorage error

This Django error occurs when an unexpected condition is encountered. Check the stack trace for the exact location and fix the root cause.

STATIC_URL not configured in Django

STATIC_URL not configured

This Django error occurs when an unexpected condition is encountered. Check the stack trace for the exact location and fix the root cause.

MEDIA_ROOT permission denied in Django

MEDIA_ROOT permission denied

This Django error occurs when an unexpected condition is encountered. Check the stack trace for the exact location and fix the root cause.

Bugsly catches Django errors automatically

AI-powered error tracking that explains what went wrong and suggests fixes. Set up in 2 minutes.

Get Started Free