ZBrushCentral

zmapper problem

Hi all. Having got to view the zmapper options in my 3.1 version, (by collapsing the right panel), I have run into another problem. As i attempt to generate a normal map for some geometry I get a pop up error saying ‘subdivid faces’.? it is actually spelt like that too. I have created a normal map for this object before, and it is definitely at level 1. Any ideas why Im getting this message?