Plate part wire geometry does not fit entirely within the plate system wire geometry, as expected.
Improper modification of the plate part and/or system.
The part or system was corrupted during database migration/upgrade.
What You Should Do
Separately try each of the following steps:
Right-click and select Update.
Manually correct other objects with errors associated with the object.
Click Recompute in the Results dialog box to recalculate the object.
Delete the object and recreate it.