This sounds like you made a taxing election for the LLC to be considered either a C or an S corporation for tax purposes, (because if you didn't, it's a disregarded entity, sole proprietorship, and I've never heard of the IRS asking for a Schedule C of $0 to be filed in this scenario). If you did make such an election, you would want to file the corresponding return, either an 1120-S or an 1120. It won't have any income, but there are still details to report on the return.
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Crud ... you are VERY late. A return MUST be filed every year by 3/15 until you close the business. File the form now ASAP and beg forgiveness from the penalty and promise to never do it again.