can you provide some mode details please ? Do you intend to store your artefacts locally or remotely ?
Does the manual reporting also fails ?

If you could also give your clearml packages versions it could help

I store the artifacts on a minio server (in my LAN).
If I run the python script locally (i.e. no execute remotely() it works fine).
I use the latest clearml 1.6.2

Did you by any chance save the checkpoint without any file extention? Or with a weird name containing slashes or points? The error seems to suggest the content type was not properly parsed

Checkpoint name is “model_pos_vga_smallBB.tar”