Export to .idml, open that and save as a new .indd. That should clear the plugin info.
If Peter's solution does not help, here's another way, because the missing plugin might just be incorrectly registered or not at all:
1. Find the location of your Indesign preferences file, copy it to a safe place, delete the original.
2. Start Indesign - it will re-register all plugins. Close Indesign again.
3. Write back the saved prefs file to the original location.