Unable to locate add on (ID=324) to component

This error comes when I generate iso from Openplant iso manager. It doesn't generate iso drawing at all. Checked with intermediate file which says this id belongs to some Hanger Test, Hangar notes etc. But we don't have any pipe support in the model, though we do have some notes in the model. Tried "mechaddin migratenotes" but no success.

Anybody have idea about this? Even in the screenshot if one looks second red item "collection was modified" etc. Does it going to make any sense to designers? I mean these info must be understandable to a modeler. Cause they work on these tools & not any programmer. Please look into this and request to Bentley to make these errors understandable pointing to exactly about the issue.

Thanks..