Board Thread:Tapped Out Help/@comment-75.27.253.18-20130116021544/@comment-5321838-20130308120134

I know this was over a month ago, but in case you still have the problem:

Did Apu himself give you the task? Did he have the yellow exclamation mark over his head? If yes, try putting the Kwik-E-Mart into storage, and putting it back in your Springfield later on. This should reset the quest.

If a different character gave you the quest, try storing and putting back that person's "associated building"...