Microsoft Access Error Restricted Access

Hi guys,
When I opened my database through a network, an error message popped up that I might not have rights in using the database.
Restricted Access!
You do not have access to this database. Please contact administrator.
I wonder why I can't access the database while an hour ago, I managed to access it. The network administrator checked it and found no problems and no changes were made ever since my last access. Please give some inputs on what areas might cause this problem. Thanks lot and more power guys.
