How do I correct this ? Do I have to redo the whole module ?
This module has to be dimensioned by Active Subset of Employees. I don't think that there is a need for another dimension. Just add an active subset in Employee List and use that subset as a dimension.
Step 1: Go to Employees list check if you have active subset already created. You should have that one by now.
Step 2: Go to EMP02 module and change the dimension from Employees list to Subset of Employees. You can change the dimensionality in "Applies to" Section of the blueprint mode of the module.