MPS Error Blank Title 138927

I am trying to enter a master production schedule but keep getting the following error:


Error Detail

============

Object reference not set to an instance of an object.

 


Stack Trace


===========


at Epicor.Mfg.Proxy.MPSImpl.GetNewMasProd(MPSDataSet ds, String partNum, String plant, Nullable1 dueDate)</font></p><p><font size="2"> </font></p><p><font size="2"> at Epicor.Mfg.UI.Adapters.MPSAdapter.GetNewMasProd(String partNum, String plant, Nullable1 dueDate)


at Epicor.Mfg.UI.App.MPSEntry.Transaction.GetNew()


at Epicor.Mfg.UI.FrameWork.EpiSingleViewTransaction.Epicor.Mfg.UI.FrameWork.IEpiAdapterLink.GetNew()


at Epicor.Mfg.UI.FrameWork.EpiViewUtils.OnGetNew(EpiTransaction trans, EpiDataView view, IEpiAdapterLink link, Boolean displayExceptions)



I am not sure what the problem is. I have entered an MPS before without a problem.

Thanks,

Melissa