How to Fix AttributeError: module ‘h11’ has no attribute ‘event’

AttributeError: module ‘h11’ has no attribute ‘event’ error occurs when an object does not have the ‘event’ attribute or method being called on it.

Here are two ways to fix the error:

  1. Ensure that the ‘event’ attribute is part of the ‘h11’ module
  2. Installing ‘h11’ module

Causes of the error

  1. Version incompatibility
  2. Incorrect import statement
  3. Typo or misspelling
  4. Module conflict

Flowchart

Flowchart of How to Fix AttributeError: module 'h11' has no attribute 'event'

Solution 1: Ensure that the ‘event’ attribute is part of the ‘h11’

Check the documentation to ensure that the ‘event’ attribute is part of the ‘h11’ module in the latest version. You need to verify the documentation for the ‘h11’ module to verify.

Another solution to the problem is to reinstall the httpcore in version 0.15.

pip install --force-reinstall httpcore==0.15

You can also use the below series of commands to resolve the AttributeError: module ‘h11’ has no attribute ‘event’ error.

cd stable-diffusion-webui 
source venv/bin/activate 
pip install --force-reinstall httpcore==0.15

Solution 2: Install the ‘h11’ module

Install the ‘h11’ module using this command: pip install h11.

If the module is already installed, you have to check if it is installed in a different location than expected by the interpreter and adjust the module import statement in your code accordingly.

Bonus solution: Update the ‘h11’ Package

If you are using an old version of the ‘h11’ module, you can update it like this:

pip install –upgrade h11

That’s it!

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