Dear FSL Experts,

I have two group Comparison, Fallowed by TBSS, VBM analysis also created Seed ROI based on VBM output. (example 3 Seed)

Now want to do probabilistic_tracking_with_crossing_fibres, I have done with Bedpostx output, the issue are

1. I am using GUI FDT, "Error Massage:- Could not open Image:- nodif_brain_mask in BEDPOSTX
2.Using Terminal 

probtrackx2 -s <basename> -m <maskname> -x <seedfile> -o <output> --targetmasks=<textfile>

I used below step ,

probtrackx2 -s merged_f1samples -m nodif_brain_mask -x 1_VBM_Sphere_mask.nii.gz -o bedpost_ut --targetmasks=<textfile>
Need help in above steps 

Example :- http://fsl.fmrib.ox.ac.uk/fsl/fslwiki/fdt/UserGuide#PROBTRACKX_-_probabilistic_tracking_with_crossing_fibres

For general idea my Bedpostx folder contain 
bvals
bvecs
data.nii.gz
nodif_brain_mask.nii.gz

and out of BEDPOSTX.bedpostX folder contain

/logs
/xfms
/bvals
/bvecs
/commands.txt
/dyads1.nii.gz
/dyads1_dispersion.nii.gz
/dyads2.nii.gz
/dyads2_dispersion.nii.gz
/mean_dsamples.nii.gz
/mean_d_stdsamples.nii.gz
/mean_f1samples.nii.gz
/mean_f2samples.nii.gz
/mean_fsumsamples.nii.gz
/mean_ph1samples.nii.gz
/mean_ph2samples.nii.gz
/mean_S0samples.nii.gz
/mean_th1samples.nii.gz
/mean_th2samples.nii.gz
/merged_f1samples.nii.gz
/merged_f2samples.nii.gz
/merged_ph1samples.nii.gz
/merged_ph2samples.nii.gz
/merged_th1samples.nii.gz
/merged_th2samples.nii.gz
/BEDPOSTX.bedpostX/monitor
/nodif_brain_mask.nii.gz


how to make it further 
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Regards,
SUBRAMONIAM AIYAPPAN,