Time machine back up fails unless I repair disk permissions each time first

I am running OSX Lion ver 10.7.5 and have had no problems using time machine.  Recently I started getting "locating backup disk" and then a window "time machine failed to access sparse bundle error -1" and Time Machine doesn't complete the backup.  I have discovered that if a I do a disk permission or even start a disk permission repair on my mac first then time machine will work normally and backup.
Also when i do a disk permission repair it always "repairs" the same errors in the iTunes directory,  a bunch of nib files are reset to be listed as directories….not sure what changed in iTunes for this
Does anyone have any Ideas?

I am running OSX Lion ver 10.7.5 and have had no problems using time machine.  Recently I started getting "locating backup disk" and then a window "time machine failed to access sparse bundle error -1" and Time Machine doesn't complete the backup.  I have discovered that if a I do a disk permission or even start a disk permission repair on my mac first then time machine will work normally and backup.
Also when i do a disk permission repair it always "repairs" the same errors in the iTunes directory,  a bunch of nib files are reset to be listed as directories….not sure what changed in iTunes for this
Does anyone have any Ideas?

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