Short Plan Year

[Guest Julie Woulfe]

Plan Year end for this Plan was 9/30/09, but is switching to calendar year. So, now there is a short plan year 10/1/09-12/31/09, which we indicated on the 5500SF in the dates and in Part IB. Have received the following Error message after submitting -

X-112 ERROR Fail when the Filing Header, Sponsor Signature date is less than the Plan Year End date unless the Administrator Signature date is equal to or greater than the Plan Year End date. Your plan will need to be amended and re-transmitted.

Does anyone know what this means, and exactly what section we need to amend? Do we need to put the plan on extension, or just file an amended return by 10/15/10?