Exception in NLohmann JSON with example code

[klehocz3]

I am trying to use the library, but get an an exception in the NLohmann JSON library. It seems that at some point it gets an "object", where it expects a string - not sure what the means. The problem also occurs with the example code. I tried to revert to older (2021) versions of both libraries (NLohmann JSON and the httplib), but still had the same issue.

Is this library compatible with the current MLFlow REST API?