Hi Treasure,
You should never see a message of this nature from Adagio. Either there is something wrong with the data, the upgrade to V9.1C did not install properly, or there's an internal program problem when a specific, unexpected sequence of events occurs.
First, run a Data Integrity Check and make sure there are no problem with the data (I don't think there will be).
Second, see if the problem occurs in the sample data when you follow the same sequence of steps. If it does, then there's either an install problem or a program bug.
Re-install the Upgrade and see if the problem persists. If it does, we'll want you to document the steps you are going through to generate the error to make sure we can re-create it here.
_________________________
Andrew Bates