It is possible that dmBridge database tables contain some rows that have
collection alias name that does not exist in contentDM anymore.
You can do the following:
Log into dmBridge database, find the table that corresponds to the menu item
that you are looking up now. Select all rows from that table that contain
collection alias that is the same as what you see above in red font.
Manually delete all those rows from that table.
UNLV Libraries Digital Collections: Results