zoneminder does not work after modifiing log level

[piratebab]

Hello all,
I had some trouble with zm on debian testing, and tried to increase the log level.
And now when I try to start zm, I have an error message:

Bareword "ZM_PATH_LOGS" not allowed while "strict subs" in use at /usr/share/perl5/ZoneMinder/Debug.pm line 265

and an error 404 when I log to zm.
I have read that it is related to config file not existing, but not understand the solution I have tried:

The path where the logs will be written must exist at php.ini:

open_basedir = /srv/http/:/home/:/tmp/:/usr/share/pear/:/etc/:/var/lib/zm/

No success.
What value have to be changed in zm data base to come back to the default debug level ?