Can Not Probuilderize

Hello!
I have looked up tutorials and the manual and I am not quite sure what I am doing wrong. I have dragged a mesh into the scene and selected it in the Hierarchy. I open the Probuilder Window but Probuilderize is grayed out and I can not get it to activate (the button remains grayed out). Is there anything I need to watch out for?
Thanks!

Edit: Is it possible that Probuilder does not work with Skinned Meshes?

 

Are you using the object selection tool? (and not face, node, or vert selection). If you have the object selected with just face selection, then "probuilderize" will indeed be grayed out.

 

Thanks for the reply! Yes, I have it selected in object selection mode. Probuilderize works on other (static) objects in the scene, just not on skinned meshes, it seems. But I may be missing something, or maybe there is some sort of workaround?

 

".....I think you should be able to create a new GameObject, attach a MeshFilter, then manually set the Mesh to that skinned mesh which would then be ProBuilder-izable." http://www.procore3d.com/forum/topic/1370-skinned-mesh/