"An unknown error occurred (-50)" after library import

Here's the gist...
I used the new feature in File:Library to reorganize my iTunes 9 library so it was easier to navigate in Finder. After that, every time I plugged the iPhone in, it wanted to copy ALL the songs over again. I tried everything I could think of, including restoring my phone. When all that failed, I followed the advice of a KB Article (http://support.apple.com/kb/HT1451) and, lo, the problem was solved.
...until I went to check for updated apps. All my iPhone apps still exist in the Mobile Applications folder in Finder, but none are present in iTunes. Any attempt to add them via drag and drop results in the error "The Application (name) could not be added to your iTunes library because an error occurred. An unknown error occurred (-50)." I also discovered that app syncing had been turned off in the iPhone settings.
With there being 121 apps in that folder, I'm certainly in no mood to redownload them all and telling iTunes to just sync apps again results in it wanting to wipe my iPhone of all the installed apps. Also not something I'm willing to do.
Any thoughts?
thanks!
dennis
Message was edited by: Dennis Alaniz2

Thanks, MJ, but that's not the problem I'm having. I can see the apps in finder, I just can't get them back into iTunes where they belong.
As further clarification to my problem, a post was created in the iPhone Hardware group where someone else is having the same problem I was (http://discussions.apple.com/thread.jspa?messageID=10236133#10236133) in conjunction with the problems listed above. By following the advice of the KB article, that problem, and the continuous copying of songs, was solved, but the missing applications problem was then created.
I'm cross referencing this post with that one so that the problem can be hit at both ends and people can be made aware of the greater scope of this issue.
dennis
Message was edited by: Dennis Alaniz2

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adamwineguy wrote:
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Help with "The iTunes Library file cannot be saved. An unknown error occurred (-54)"

Hi,
Has anyone else had this problem? And how do I correct it? "The iTunes Library file cannot be saved. An unknown error occurred (-54)"

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== Error -54 ==
From an OS9 reference, error -54 is a software lock on a file or a permissions error. (Some of the old codes still apply to OSX although there is no formal list of OSX error codes.)
First, try simply restarting your computer.
iTunes Library cannot be saved (Error -54) - https://discussions.apple.com/thread/1912814

ITunes comes up saying the iTunes library files cannot be saved. an unknown error occured

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"An unknown error occurred (-50)" after library import

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