Exception error when logging in to Plesk (permission denied)

Hello,

After a stupid CHMOD -R apache:apache on my server (...), I had to reinstall Plesk (12.5.30) with "plesk repair installation".
That was successfull except Restoring SELinux contexts => Starting kavehost : Failed

Unfortunately, i am now unable to loggin in Plesk :

Internal error: Lock Manager error: 'Permission denied'.
Message Lock Manager error: 'Permission denied'.
File Hierarchical.php
Line 120
Type Plesk\Lock\Exception

Then, i tried a lot of solutions :...

Exception error when logging in to Plesk (permission denied)