I have this *.xlsm file I made with Excel 2007, and it won't work in Excel 2010.

As I open the file, a pop-up is displayed:

The object library is not valid or contains references to object definitions that cannot be found.

(this is my translation from the pop-up in Italian, please forigve me if it is not 100% as in the English Excel)

No macro works, not even the calendar. The same pop-up keeps displaying. How do I know which libraries I need to import in Excel 2010?
In the VB editor, I checked under Tools > References both in Excel 2007 and Excel 2010 and the flagged ones are the same.