Input needed in DWI QC

I try using Diffusion–>Process–>GraQC
Input volume I upload the nrrd file but I don’t know about the input volume mask
If I check create the mask gives an error
What do I have to upload in Input volume mask and how do thet volume

What extension comes with the GraQC module? I might be able to take a look.

Input volume should be .nrrd
Then input mask I don’t know. This is my problem.

What kind of mask is it requesting?