Trying to troubleshoot/debug without context or reference is really difficult, and the truth is that most bugs are in developer implementations, not the underlying libraries
in this case, a minimal reproducible example might be something like a project with a single endpoint and the dependencies you're using, that fails with the same error in deployment
tbh, i don't really understand using a metaframework with an additional backend. the value of a metaframework generally comes from the integration of the front + backend in a single system