The reason for this error is due to the fact that one or more of the selected Contact records is tied to a Blackbaud Grantmaking user. The error itself is somewhat misleading and we consider the error reporting to be a Bug in our software.

This does not mean that we cannot assist in addressing your needs where your contact records lie. Please open a case with Blackbaud Grantmaking Support through 877-704-3343 or via CaseCentral and we will handle your user change request as necessary.