gettin error message when trying to set origin and floor in tracking

Hello all.
working on a tracking blend.
1.All seemed to be going well. But when i went to set the floor and the origin i get this message " at least one track with bundle should be selected…"
I selected three diff tracking points for the floor. They all have recorded motions (the little blue/red streaks)
And the origin point. should be fine as well.

How do I go about fixing this, anyone else run into it?

thx
d