I have been getting that message off and on for the last week or so. When it happens, Spot Collector no longer highlights needed countries, etc, and the re-compute button is grayed out. The only solution is to restart Spot Collector and the do a recompute.
The error log says "program error 91 in module LOgDataBaseModule..........
Once I fix it, it will work fine for a day or a few hours and then happen again. When it does occur, it is when WSJT/JTAlert are doing the logging.