Issue
An attempt was made to add an object that already exists.
Environment
LNS
LonMaker
Vista
NL220
Cause
An attempt was made to add an object that already exists.
Resolution
Something has become corrupted in the database. Resynchronize the drawing to ensure that an item is not just missing from the page and needs to be deleted. If this doesn’t work, restore the most recent backup where the error was not occurring.