Self-consistency error; value generated for start of 5759 is not 21-sep-98
When Q++Studio is launched, it generates the list of Jewish leap years and Jewish years' start dates. As a self-consistency check it verifies that the start of 5759 that it has just generated is September 21, 1998.
Usually this error can only happen after an update to Q++Studio where additional Jewish years have been added, and an error was made in entering this new data.
If you get this message, contact technical support, and in the meanwhile re-install a previous update of Q++Studio. You should not keep on using the current version of Q++Studio since all Jewish dates will be wrong.