I upgraded my Domino 9.0.1 to 10 after my databases (used POI import/Export) give POI libraries errors. I'm using Eclipse Update Site database for loading POI. I tested po
Your Target Platform setting in Designer may have been messed up by the V10 upgrade - it's a very-common issue with 9.0.1FP10 and V10. "Fix #1" here may be what you need: https://frostillic.us/blog/posts/058650E080E352178525832B00519D2C