Can't open model file 'exec'

Hi guys,
I’m stuck with the exec command.
I’ve installed the addon with apt, it is in the right folder, it has all the rights for openhab to use it, but on the log I see:

[ERROR] [i.h.s.p.PersistenceModelHelper] - Can't open model file 'exec'

My item looks like this:

Switch  TEST    "CL"    <bath>  { exec="ON:/etc/openhab/configurations/" }

The script is executable from the user openhab and owned by him.
What can the problem be? I’ve looked over the Internet but I seem to be the only one suffering from this problem.

Sorry guys…I installed the persistent and not the binding… :expressionless:
Problem solved!