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
DoesNotExistThe query returned no results when exactly one was expected.
Multiple objects returned Django
MultipleObjectsReturnedThe get() query matched more than one object.
Duplicate key IntegrityError Django
IntegrityError: duplicate keyYou tried to create a record that violates a unique constraint.
NOT NULL constraint failed Django
IntegrityError: NOT NULL constraintA required field was left empty.
Cannot resolve keyword Django
FieldError: Cannot resolve keywordYou used a field name that doesn't exist on the model.
No such table Django
OperationalError: no such tableThe database table doesn't exist, usually because migrations haven't been run.
No such column Django
OperationalError: no such columnA model field was added but migrations weren't created/applied.
Relation does not exist Django PostgreSQL
ProgrammingError: relation does not existThe PostgreSQL table hasn't been created yet.
You have unapplied migrations Django
PendingMigrationErrorThere are migrations that haven't been applied to the database.
Inconsistent migration history Django
InconsistentMigrationHistoryThe migration history in the database doesn't match the migration files.
Template syntax error Django
TemplateSyntaxErrorThe template has invalid syntax like unclosed tags or wrong filter usage.
Template does not exist Django
TemplateDoesNotExistDjango can't find the template file.
No reverse match Django URL
NoReverseMatchDjango can't find a URL pattern matching the name and arguments.
Page not found 404 Django
Resolver404No URL pattern matches the requested path.
Validation error Django form
ValidationErrorForm or model validation failed.
CSRF token missing or incorrect Django
CSRF verification failedThe POST request is missing or has an invalid CSRF token.
Permission denied 403 Django
PermissionDeniedThe user doesn't have permission for this action.
Improperly configured Django settings
ImproperlyConfiguredA Django setting is missing or incorrect.
Invalid HTTP_HOST header Django
DisallowedHostThe request's Host header isn't in ALLOWED_HOSTS.
Field does not exist Django
FieldDoesNotExistYou referenced a model field that doesn't exist.
Object does not exist Django generic
ObjectDoesNotExistGeneric version of DoesNotExist for any model.
Current transaction is aborted Django
DatabaseError: current transaction is abortedA previous database error wasn't handled, poisoning the transaction.
N+1 query problem Django ORM
N+1 query problemEach loop iteration triggers a separate database query.
Max length exceeded Django
MaxLengthValidatorThe field value exceeds the max_length constraint.
Related object does not exist Django
RelatedObjectDoesNotExistAccessing a reverse ForeignKey or OneToOneField that doesn't have a related object.
Migration schema missing Django
MigrationSchemaMissingThe django_migrations table doesn't exist.
Static file not found Django
staticfiles.finders.FileSystemFinderDjango can't find the static file.
Database connection refused Django
ConnectionRefusedError databaseDjango can't connect to the database server.
Suspicious operation Django
SuspiciousOperationDjango detected a potentially malicious request.
Apps not loaded yet Django
RuntimeError: apps aren't loaded yetYou tried to use Django models before django.setup() was called.
FieldInvalid field name for model in Django
FieldError: Invalid field name for modelThis 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 CharFieldThis 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 concreteThis 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 setThis 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 defaultThis 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 DoesNotExistThis 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 operationThis 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 connectionsThis 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 requiredThis 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 closedThis 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 typeThis 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 textThis 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.NotSupportedErrorThis 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_migrationsThis 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 modelThis 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 migrationsThis 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 fieldsThis 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 remainderThis 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 tagThis 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 templateThis 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 namespaceThis 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 parametersThis 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 explicitlyThis 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 baseThis 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
SuspiciousMultipartFormThis 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
RequestDataTooBigThis 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
TooManyFieldsSentThis 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 cookieThis 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 middlewareThis 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
MiddlewareNotUsedThis 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 failedThis Django error occurs when manage.py command failed. Check the stack trace for the exact location and fix the root cause.
AppRegistryNotReady in Django
AppRegistryNotReadyThis 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 labelThis 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 missingThis 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 existThis 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 serializableThis 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 uploadThis 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 errorThis 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 missingThis 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 exceededThis 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 unavailableThis Django error occurs when redis cache unavailable. Check the stack trace for the exact location and fix the root cause.
MemcachedKeyLengthError in Django
MemcachedKeyLengthErrorThis 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 errorThis 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 permittedThis 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.NotRegisteredThis 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.AuthAlreadyAssociatedThis 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.NotAuthenticatedThis 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.ThrottledThis 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.ParseErrorThis 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.UnsupportedMediaTypeThis 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 errorThis 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 errorThis 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 errorThis 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 deniedThis 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 errorThis 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.DenyConnectionThis 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 errorThis 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 misconfiguredThis 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 errorThis 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 errorThis 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 FieldErrorThis 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 errorThis 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 errorThis 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 FileNotFoundErrorThis 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 timeoutThis 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 errorThis 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 errorThis 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 errorThis 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 configuredThis 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 deniedThis 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