Problem authorizing my computer?

have my iphone plugged in, trying to sync a new playlist. itunes is telling me that this computer is no longer authorized for application stored on this iphone. and that I need to authorize this computer. When I try, it tells me that there was an error storing my authorization information, the required directory was not found, or has a permission error, Correct this permissions problem and try again, deauthorize this computer is the permission cannot be changed.
Can someone please help?

I'd try repairing disk permissions:
Open /Applications/Utilities/Disk Utility
Select Volume on left, click 'repair disk permissions' on right.
If that doesn't work maybe reinstall iTunes: http://support.apple.com/kb/HT1224

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