ProSeries was able to guide me through removing the Schedule K-1 for the former shareholders. I had removed the shareholder information in the K-1 worksheet but it was still showing errors because the K-1 was not able to be deleted.  My shareholder count was still at 2 etc. They had me go to the k-1 worksheet of the nonexistent shareholder, click on “quickzoom” to the Sched K-1. This brought up an untitled K-1, right click in the middle of the panel containing the check boxes for Final & amended K-1 (under the tax year information). A drop down box appeared and the top choice was “remove K-1 Untitled”. All info associated with this K-1 was deleted and I was able to e-file the extension and will be able to e-file the return without entering shareholder info with 0 ownership.