Error 3075: Syntax error (missing operator) in query expression...

In general, this error occurs when one of ChurchTrac's support files is either not the correct version, or is not registered properly with Windows. Installing or re-installing the latest ChurchTrac program update should resolve this problem in most cases. If you are still seeing this error after installing or reinstalling the latest update, please contact support for assistance.

This error sometimes also occurs in connection with the Attendance screen (see below).
 

If you encountered this error on the Attendance Screen...

This error is caused when you click the "Add a Guest or New Member" button on the Attendance screen after a group has been deleted.

If you created a set of attendance records, then if you delete the groups (from the Groups screen) that were associated with that group category, you won't be able to add new people to a group that no longer exists. The solution to this error is to be sure you have your groups and classes set up properly on the Groups screen, then delete and re-create the attendance events that are causing this error.

For additional help with setting up groups and attendance, see the knowledgebase article: How do I set up groups and attendance?