Python Project Creation Error, 'Input may have contained something the server did not know how to handle'

When using Python to push projects to Asana, the code (which has been working for months and hadn’t had any changes) stopped working, raising this error:

asana.error.ServerError: Server Error: Oops! An unexpected error occurred while processing this request. The input may have contained something the server did not know how to handle. For more help, please contact api-support@asana.com and include the error phrase from this response.

I tried with multiple different projects, and they all raised this error, which makes me think it’s not a data issue, but possibly a server issue. I’ve been having this issue for several days. Any ideas for things I can check to debug this?