Have you tried to open a new library by holding down the option key on launch?
I suggest opening 2 finder windows. One finder window displaying your Aperture application and the other displaying your Aperture library. Then, select each one to confirm they both show the same version in the info area (or command+i to get info). Once you know for sure they are the same, drag that library onto the Aperture application in that folder.
I suggest making sure your Aperture and systems are updated to the latest.
Aperture Library Info says 3.3
Aperture Info application says 3.3
I have tried dragging the library into the Aperture but it still says library is from a newer version of Aperture.
I assume you mean to drag the flower icon onto the Aperture icon when both info panels are open.
Trash Aperture's "preferences" file: it may be locked to a wrong library.
Then try to double click your Aperture library to open it directly.
Remove the Aperture's user preferences from the User Library as described here:
Your User Library is hidden by default in 10.7.5 - to open it in a Finder window use the "Go" menu from the Finder's main menu bar.
- Quit Aperture, if it is running. Log off and on again.
- Open the user library by using the Finder's "Go > Go to Folder" menu and hold down the options-key, until "Library" appears in the drop down menu. Select it.
- In the widow that will open, scroll down to "Preferences"
- From the "Preferences" folder remove "com.apple.Aperture.plist".
Then try to launch Aperture again.
But deleting the "Preferences" file will cause Aperture to forget the preferences settings. Be prepared to have to reset all options you set using the Aperture Preferences panel.