This error message indicates that two processes in the database attempted to occur at the same time and as a safeguard SQL has decided to stop one of them from happening. Typically this error is a good thing as it indicates that something bad tried to happen and SQL stopped it. Try to do the process again. If you receive this message more than once in a row please contact Blackbaud Customer Support at 877.704.3343 or create a case in Case Central as it could indicate something bigger.