Hello,
The problem seems related with your group name.
Try the following :
1. command line 'id' and see name after gid (if different of petrouch, then 2)
2. chown, -R, petrouch:gid, /home/petrouch/.local/share/openGribs
If not different send again a message here, the principal developper will also check (and as he is more qualified than me, he may have the correct answer)