[ubuntu_studio] jstest-gtk glibmm error

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http://ubuntuforums.org – Ran jstest-gtk today, tried to run the maping editor but it crashed. tried again via terminal and got this output. Code: jstest-gtk terminate called after throwing an instance of 'Glib::FileError' Aborted glibmm-ERROR **: unhandled exception (type std::exception) in signal handler: what: Couldn't convert '300' to string aborting... Aborted I know enough to know the problem relates to the gui librarys but why and how to fix it i am in the dark. (Hardware)