Topology vs Sculpt

Hi everybloody. Awesome newbie with a question.
Blender doesn’t let me apply the multiresolution modifier after sculpting. “Constructive modifier cannot by applied to multi-res data in sculpt mode.” How do I do this? Because this seems necessary before laying a topology.

Apply it in object mode, just set the preview resolution to match your sculpt resolution.

Also, this is in no way “Latest News”. Do not post things in the News and Discussion forums just to get them seen.