Comment 1 for bug 274272

Are trying to run it on Windows? Windows is still not supported, it would be strange if it worked (although the GUI should show if you have php-gtk)

Anyway, this error shouldn't happen, have you installed php-gtk? For a future Windows version you'll need it, you can get it prepackaged from http://gnope.org/

Please install it and try again. I'll be hearing back for feedback!