1. Launch Studio One and go to Preferences > Advanced > Services
2. Disable all plugin support there, AU, VST & VST3.
3. Restart Studio One.
4. Open the song. If it opens, remove the placeholder plugins for Code Red Free anywhere you used it and save the song.
5. Go to Preferences > Advanced > Services and turn all plugin support back on.
5. Restart Studio One and if that plugin was the cause, the song should load now.