Hello Abdo,
That is a problem you cannot solve for yourself. The administrator should do it.
On other hand, do you refer to Mascaret the module or OpenTelemac-MASCARET, all modules? Well, I supposed it is all modules. In that case, I noticed that
wiki.opentelemac.org/, where you can find the steps to follow in case automatic-installer fails, throws this error you mentioned above.
I have made an Installation guide that I would like to prove, so, you can use it freely (and anyone who needs it). I believe it will be helpful, I have not finished it (there are several modifications I have to make), but it can be used.
Please find it following the link below
drive.google.com/open?id=0BxYwOb2RaOSfMEJwem5IYmNYZjQ
I hope it helps you. Please make me know your feedback.
Cheers,
José Andrés.