I found the problem.
Centovacast failed to create source.log  /usr/local/centovacast/var/vhosts/username/var/log
I created the log file manually, but now there is a new error.

Status change
Stream could not be started: Application liquidsoap exited immediately after startup.

Return

Diagnostics
Details:
Last 1 lines from the relevant log file:
===============================================================================

but source.log is empty ?
I tried with fixprms, did not work.
Any ideas ?
P.S.
The True Way for mysql socket is /var/run/mysqld/mysqld.sock