Error: nextcloud had a failure Exception

Hi everyone
I’m trying to install NextCloud plugin first time on my TrueNAS-12.0-U8 or 13.0 and I’m getting following error at the end:
Error: nextcloud had a failure Exception: RuntimeError Message: pkg error: - nginx : Refusing to fetch artifact and run post_install.sh! Partial plugin destroyed

What is the problem? any ideas why I’m not able to install and run nextcloud plugin?
thanks