NC data located in Freenas NFS share

Hi, am trying to setup Nextcloud in Proxmox VM via snap installation with Data folder located in Freenas folder.

I am able to mount the Freenas nfs share to the VM, but the moment i change the data directory location in NC config file i get a error on opening NextCloud.

"Internal Server Error

The server encountered an internal error and was unable to complete your request.
Please contact the server administrator if this error reappears multiple times, please include the technical details below in your report.
More details can be found in the server log."

What am i missing ? plz help me out , i tried changing the data directory before & after setup as well but same fate.