Deleting reference to missing plugins on song launch (startup)

I have a song from a previous version of sonar (version 4 producer) I am now using 8.5 and the arkaos plugin I thought I deleted use of in track view seems to be sought by sonar 8.5 in the same song I migrated to 8.5 from 4. I do not need this plug in on this song and do not want to  have this missing plugins window pop up every time this song is launched as it messes me up in play list mode.
 
Upon song launch it states:
 
"The following plugins are referred to by this project, but could not be found. They may be missing or improperly installed on your system.
The original plugin state is saved by stand in plugins, and will be restored if you save the project and subsequently load it on a system where the plugins are properly installed.
 
Warning: If you loaded this file in "safe mode", overwriting this file will result in the permanent loss of these effects. "

Yea, make sure there is no trace of the plugins anywhere in sonar or you will get that missing plugin message
Cj

I've got the same problem, an old Boost11.dll that is not on my computer. It keeps coming up before every song I load and it is NOT in the synth rack and I've rescanned, and moved all my VSTs to one folder, etc. Help?