VocALign could not do this because...

If this message appears when you click the "Capture Guide" or "Capture Dub" button in your VocALign Project or VocALign Pro ARA2 plug-in:

VocALign could not do this because...

Either no Guide has been selected or VocALign could not access the selected Guide. Please make sure that you have added VocALign (ARA) to the Guide's track.

Make sure you have selected the clip you want to capture for alignment.
This will yield a successful capture of your audio clip in your active VocALign plug-in.