Error in creating wm_fod map

Dear all,
I tried to create FOD map like wm_fod and csf_fod and gm_fod by using Mrtrix command " dwi2fod msmt_csd dwi.mif -mask mask.mif response_wm.txt wmfod.mif response_gm.txt gmfod.mif response_csf.txt csffod.mif" it works well but when i displayed each one I see errors and missing information on the map, you see it in the picture that I’m joining it with this message

This is most likely a result of a poor mask – unfortunately dwi2mask is not nearly as robust as we would like. You have what looks like a pronounced bias field in your data, so I wouldn’t be surprised if that’s the source of the problem. Lots of discussion on this issue in this forum, e.g. this topic.