Hard to troubleshoot related - Expose Python plugin stderr in error logs · Issue #6506 · stashapp/stash · GitHub
But I think these issues are related to not having git installed (that’s how PythonDepManager) pulls the dependencies.
Either way, this plugin is functional, one consideration though I recommend only using the single axis functionality. The multi axis feature did not turn out to have great results. Right now you can start analysis using Haven VLM Connector and I may be able to reuse position tagging from there to convert into multi axis funscripts.