"When using Valid Frames, each Frame Range must have at least (1) Training Frame to Track.
Range <manual range> does not contain any Training Frames"
When tracking in Analyzer, each separate valid section of the frame range must contain at least one training frame, even if the training frame was not used when training a model. This frame serves as an initialization frame and gives the tracker a reference point.
Make sure each valid frame range (denoted by a light blue line in the timeline) that you are currently trying to track has at least one training frame.