Time machine reporting space error

My TM backups are coming back with an error saying that my backup is XX.X and I only have XX.X space on my external drive. The confounding thing is that the external HDD has more than double the space that the backup needs. I have attached a couple of screen shots with the error. I have done a surface scan with Drive Genius 3 to make sure that a bad block wasn't the cause.
Any ideas?

Time Machine works on a recursive algorithm to try and maximize the archival capability of its backups.  If it can't maximize it, it will report an error.  Generally speaking your backup drive needs to be at least twice the size of the original.  Because the algorithm itself gives you no control over when it considers an archive too old to preserve, I recommend making manual Time Machine backups instead of automatic by controlling it with Time Machine switch in Apple menu -> System Preferences -> Time Machine.  When off, go ahead and backup the archives that are most important to you, somewhere other than the Time Machine drive.  Otherwise if the original drive does not retain the data, it will eventually vanish.

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    PapaFunk wrote:
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