i am still getting that error but frankly i have no idea what exactly issue would be? thanks!
There are some warnings regarding your setup.
The reverse proxy header configuration is incorrect, or you are accessing Nextcloud from a trusted proxy. If not, this is a security issue and can allow an attacker to spoof their IP address as visible to the Nextcloud. Further information can be found in the documentation ↗.
Typically that error means exactly what it says. Sadly I don’t have any information to determine which might be the case. You should consider filling out the support post template, and maybe someone who uses nginx will spot the problem.