Dynamics NAV 2013 permission

Hi,

I have problem with user permission. I want to create a page in Microsoft Dynamics NAV Development Environment.

But when i save it it's write : "You do not have permission to create 'Page Name' Page. Contact your system administrator to have your permissions changed."

But i'm SUPER, i have edited my user (Administrator) and he is SUPER (This role has all permissions.)

If somebody can help me :)

PS : I have MSDN Licence maybe this is the problem ?

Thanks in advance !

Arnaud'