Spectral Layers is an audio processing plugin. You must have an unlicensed copy of it inserted somewhere in that song. If you have a valid license for spectral layers, you need to open spectral layer and authorize it. If you do not have a valid license for spectral layers, you need to find where it is inserted in that song and remove it, then re-save the song, also, uninstalling spectral layers from your computer then rescanning your plugins is also a good idea to make sure it’s completely removed.
