You receive a run time error when navigating to Site explorer > Parts or when attempting to create a new part by editing a page. You may also see the error when trying to insert a part on a page.
This can be caused by a version mismatch if you are split hosted. For example, If Blackbaud NetCommunity has been upgraded to Service Pack 3 while The Raiser's Edge Web Services server (REWS) is on Service Pack 2, this error can be generated as a result. The error only shows when creating new parts by navigating to Site explorer > Parts or when editing a page and creating a new part on the page. Existing parts will continue to function, and you can edit existing parts.