Error: No access permission as table is already locked

1. Some times just by restarting infopakage, data is loaded and problem is solved.
2. Other times restarting still gives red light and data load failed because of the table is locked. In that scenario, follow below to solve it.
3. Click on the lock icon (key) on the menu bar.

4.High light the characteristics, right click and delete lock. Once the lock is deleted restart the infopackage, it should work now.