[SOLVED] Cannot edit Access Rights of a share

I want do edit the access rights of a share, which already has data on it, from root to something else. I always get the following errormessage:

Houston, we’ve had a problem.
Error running a command. cmd = /bin/chown -R div0:root /mnt2/common. rc = 1. stdout = [’’]. stderr = [’/bin/chown: changing ownership of \xe2\x80\x98/mnt2/common/.SsC_201704110200/video/3D/mesek/The Good Dinosaur 2015 1080p 3D BluRay Half-OU x264 DTS-JYK/Subs/English(SDH).srt\xe2\x80\x99: Read-only file system …

Solved it. Had to delete the Snapshots of the share, which where set to readable only. Then i could change the access rights of the share