Microsoft Visual Basic Compile Error

I'm running an Access on Windows Vista Ultimate database with some Visual Basic Access code on it. When I tried to work on VBA code, I receive the following error message:
Visual Basic
Compile error is hidden module: unifunctions
I already tried to solve the problem by checking this item on Microsoft DAO 3.6 Object Library. I Pressed Alt-F11 to open the Microsoft Visual Basic window. Then, I, selected References under the Tools menu from Microsoft Visual Basic window. When the References window appeared. I Scrolled down until I found the option called "Microsoft DAO 3.6 Object Library". I checked this item and finally clicked the OK button but this error is still there. I expected that this error message will disappear after the database recognize the object but nothing happened.
I hope someone can help me fix this problem.
