Openshift Magento: mage.php not found

[Spark]

Good morning,
I'm trying to install Magento in the Openshift cloud computing server by using git repository. When trying to start the application I get the following error: /var/lib/openshift/55f57dca7628e1ebf500007d/app-root/runtime/repo/app/Mage.php was not found (But in the App folder in the local repository I have cloned I can notice such .php file).
I haven't  idea of what is going on. Could someone help me to solve such nasty problem?

Thank you.

[Mukesh Tiwari]

@Spark What is the file permission for the Mage.php file?

[Spark]

I have no idea about files permissions. Openshift is a cloud computing service where I work through a versioning software (git) and Netbeans IDE. I just have a "repository" which I commit and push. In a certain sense it's like I work in the dark. i don't know about permission or system variable neither. But the message says "was not found", it doesn't say something like "not writable/readable" ("/var/lib/openshift/55f57dca7628e1ebf500007d/app-root/runtime/repo/app/Mage.php was not found").
What should I do?