Errors/Python

TypeError: super().__init__() Missing Arguments

TypeError: __init__() missing 1 required positional argument: 'message'

Quick Answer

Your subclass is not passing required arguments to the parent __init__. Make sure super().__init__() receives all arguments the parent class expects.

Why This Happens

When subclassing, you must call the parent __init__ with required arguments. If the parent expects parameters but you call super().__init__() without them, Python raises TypeError.

The Problem

class AppError(Exception):
    def __init__(self, code):
        super().__init__()
        self.code = code

The Fix

class AppError(Exception):
    def __init__(self, message, code):
        super().__init__(message)
        self.code = code

raise AppError('Something failed', 500)

Step-by-Step Fix

  1. 1

    Check parent __init__

    Look at what arguments the parent class expects.

  2. 2

    Pass required arguments

    Forward all necessary arguments to super().__init__().

  3. 3

    Document the interface

    Make it clear what arguments your subclass constructor expects.

Bugsly catches this automatically

Bugsly's AI analyzes this error pattern in real-time, explains what went wrong in plain English, and suggests the exact fix — before your users even report it.

Try Bugsly free

Related Errors

TypeError: Missing Required Positional Argument

TypeError: __init__() missing 1 required positional argument: 'name'

TypeError: Wrong Number of Arguments

TypeError: foo() takes 2 positional arguments but 3 were given