TypeError: can only concatenate str (not "NoneType") to str

I'm getting this on pretty much any command. Even when going from python to python to try having it debug, test, etc or convert to different libraries with the --guidelines.

Here's the full console output (note this is an example with an obscure language, but getting the same on py to py):

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 ➜ /workspaces/ODB/gpt-migrate-main/gpt_migrate (main) $ python main.py --sourcelang EasyLanguage --sourcedir /workspaces/ODB/Python/ELtoPy/ELSrc --sourceentry OD_23.02-Strategy.el --guidelines "You specialize in trading algorithms, you are an expert in converting TradeStation EasyLanguage code to Python using the Lumibot library" --targetdir /workspaces/ODB/Python/ELtoPy/PyTgt --targetlang python 

◐ Reading EasyLanguage project from directory '/workspaces/ODB/Python/ELtoPy/ELSrc', with entrypoint 'OD_23.02-Strategy.el'.
◑ Outputting python project to directory '/workspaces/ODB/Python/ELtoPy/PyTgt'.
Source directory structure: 

        ├── OD Strat Mashup.el
        ├── ELtoPySrc/
            │   └── OD_23.02-Strategy_GH-CoPilot1.py
        ├── OD_23.02-Strategy.el
        ├── OD_23.02-Strategy copy.el
        └── OD_23.02-Strategy_GH-CoPilot1.py

✅  Creating your environment...
Created Docker environment for python project in directory '/workspaces/ODB/Python/ELtoPy/PyTgt'.
Traceback (most recent call last):

  File "/workspaces/ODB/gpt-migrate-main/gpt_migrate/main.py", line 127, in <module>
    app()

  File "/workspaces/ODB/gpt-migrate-main/gpt_migrate/main.py", line 100, in main
    migrate(sourceentry, globals)

  File "/workspaces/ODB/gpt-migrate-main/gpt_migrate/main.py", line 94, in migrate
    internal_deps_list, external_deps_list = get_dependencies(sourcefile=sourcefile,globals=globals)

  File "/workspaces/ODB/gpt-migrate-main/gpt_migrate/steps/migrate.py", line 58, in get_dependencies
    external_dependencies = llm_run(prompt,

  File "/workspaces/ODB/gpt-migrate-main/gpt_migrate/utils.py", line 39, in llm_run
    output = globals.ai.run(prompt)

  File "/workspaces/ODB/gpt-migrate-main/gpt_migrate/ai.py", line 49, in run
    chat += msg

TypeError: can only concatenate str (not "NoneType") to str

Another example:

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➜ /workspaces/ODB/gpt-migrate-main/gpt_migrate (main) $ python main.py --sourcelang python --sourcedir /workspaces/ODB/Python/ELtoPy/ELSrc/ELtoPySrc --sourceentry OD_23.02-Strategy_GH-CoPilot1.py --targetdir /workspaces/ODB/Python/ELtoPy/PyTgt --targetlang python 
◐ Reading python project from directory '/workspaces/ODB/Python/ELtoPy/ELSrc/ELtoPySrc', with entrypoint 'OD_23.02-Strategy_GH-CoPilot1.py'.
◑ Outputting python project to directory '/workspaces/ODB/Python/ELtoPy/PyTgt'.
Source directory structure: 

        └── OD_23.02-Strategy_GH-CoPilot1.py

✅  Creating your environment...
Created Docker environment for python project in directory '/workspaces/ODB/Python/ELtoPy/PyTgt'.
Traceback (most recent call last):

  File "/workspaces/ODB/gpt-migrate-main/gpt_migrate/main.py", line 127, in <module>
    app()

  File "/workspaces/ODB/gpt-migrate-main/gpt_migrate/main.py", line 100, in main
    migrate(sourceentry, globals)

  File "/workspaces/ODB/gpt-migrate-main/gpt_migrate/main.py", line 94, in migrate
    internal_deps_list, external_deps_list = get_dependencies(sourcefile=sourcefile,globals=globals)

  File "/workspaces/ODB/gpt-migrate-main/gpt_migrate/steps/migrate.py", line 58, in get_dependencies
    external_dependencies = llm_run(prompt,

  File "/workspaces/ODB/gpt-migrate-main/gpt_migrate/utils.py", line 39, in llm_run
    output = globals.ai.run(prompt)

  File "/workspaces/ODB/gpt-migrate-main/gpt_migrate/ai.py", line 49, in run
    chat += msg

TypeError: can only concatenate str (not "NoneType") to str