[BUG] Local Debugging Fails With "KeyError: '__main__'"

Investigative information

Please provide the following:

• Timestamp: 2021-08-30T14:04:57.007Z
• Function App name: n/a local debug
• Function name(s) (as appropriate): n/a local debug
• Core Tools version: 3.0.5368
• Function Runtime Version: 3.0.15828.0

Repro steps

Provide the steps required to reproduce the problem:

1. Download repo
2. Initialize .venv with python 3.9.6
3. Initialize debugging session in vscode with F5
4. Get error

[2021-08-30T14:16:09.495Z] Worker failed to function id 5cfd6c05-6b2d-46e8-b09f-6c5c8a0ac887. [2021-08-30T14:16:09.496Z] Result: Failure Exception: KeyError: ‘main’ Stack: File “C:\Users\tyler\AppData\Roaming\nvm\v16.8.0\node_modules\azure-functions-core-tools\bin\workers\python\3.9/WINDOWS/X64\azure_functions_worker\dispatcher.py”, line 301, in _handle__function_load_request

Expected behavior

Provide a description of the expected behavior.

Expect debugging to continue successfully.

Actual behavior

Provide a description of the actual behavior observed.

Does not work.

Known workarounds

Provide a description of any known workarounds.

Works on my other machine. Have not tried a fresh install yet.

Contents of the requirements.txt file:

Provide the requirements.txt file to help us find out module related issues.

azure-functions
azure-functions-durable
usaddress-scourgify

Related information

Provide any related information

https://github.com/tyler555g/AzureDurableFunctionsExample

[niekvleeuwen]

Updating to Azure Functions Core Tools 4.0 fixed the exact same issue for me.

[YunchuWang]

Tried with core-tool 4.0 and issue no longer occurs.