I get this error when trying to import v5 data into this v5 Docker, using latest version, didn't work with previous version of v5 either.
Using JSON file, saw it was reported in the InvoiceNinja forums, some still had issues, was said to be resolved in 5.3.1, but it isn't for me. I had migrated from v4 to v5 hosted before trying to export and import to go self hosted.
Could you provide an example of SWAG config? I am trying to do it work with swag+authelia using the swag dockermods "auto proxy". I think I am missing something because I can't make it work, while other unraid apps works perfect with swag+authelia label.