(OpenShift) Permission denied when installing my own cartridge from my github repository

I froked MySQL cartridge from official github repo and I added some modifications to support utf8mb4 encoding. this is my cartiridge on github : https://github.com/amgohan/openshift-origin-cartridge-mysql-utf8mb4 When I want to add this cartridge to my scalable php app using the openshift web admin panel by providing https://raw.githubusercontent.com/amgohan/openshift-origin-cartridge-mysql-utf8mb4/master/metadata/manifest.yml. I get this error : Shell command '/sbin/runuser -s /bin/sh 54474a6a500446ad2d0000ac -c "exec /usr/bin/runcon 'unconfined_u:system_r:openshift_t:s0:c5,c230' /bin/sh -c "/var/lib/openshift/54474a6a500446ad2d0000ac/mysql-utf8mb4/bin/setup --version 5.5""' returned an error. rc=126 /bin/sh: /var/lib/openshift/54474a6a500446ad2d0000ac/mysql-utf8mb4/bin/setup: Permission denied I don't know what's wrong, can anyone help ?