Logic Pro 7 & earlier File Not Found - Result Code 43

I'm a Logic 6.4.1 user - just finishing a project with no problems - but today opened a song that searched for some new audio that should have been there. I gave up looking, but when I try to record I get "FIle Not Found - Result code 43 and it will not go into record (won't play). I've deleted the blank files from the Audio list, rebooted, & set a new record path just in case, but no go. Any ideas out there?

Frustrated in Vancouver
Oh man, I should have tried a few more things! I found an unused midi instrument way down the list that was in advertently in record. All I can hope is that this blunder helps someone else down the road. Sorry to waste your time reading!!
Actually, that didn't solve the problem. I finally figured out my audio files were not where I thought they were, so I 'saved as project' again and all was well.