Originally Posted by falko
Please check your php.ini and make sure that the functions exec and shell_exec are not disabled in it.
I don't see shell_exec listed or exec. Where in the file would I found it?
Go to the PHP open_basedir field on the Options tab of your web site in ISPConfig and add all directories that your applications needs access to.
As far as this, it comes with the default so I will see that it is looking for.