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Dear experts, I'm trying to analyze FA and MD data using TBSS. Preprocessing of data (e.g, DTIFit, eddycorrect..) was performed using FSL version 4.1.5. and serial steps of TBSS was carried out using version 4.1.8. TBSS of FA seems OK, however, when I tried to process MD data using tbss_non_FA script, the following error message comes up. Loading Data: [kim@localhost FA]$ randomise -i all_MD_skeletonised -o tbss_MD -m mean_FA_skeleton_mask -d stats.on -n 5000 -D --T2 -V randomise options: -i all_MD_skeletonised -o tbss_MD -m mean_FA_skeleton_mask -d stats.mat -t stats.con -n 5000 -D --T2 -V ** ERROR (nifti_image_read): failed to find header file for 'all_MD_skeletonised' ** ERROR: nifti_image_open(all_MD_skeletonised): bad header info ERROR: failed to open file all_MD_skeletonised ERROR: Could not open image all_MD_skeletonised Image Exception : #22 :: Failed to read volume all_MD_skeletonised ERROR: Program failed An exception has been thrown Failed to read volume all_MD_skeletonisedTrace: read_volume4DROI. How can I solve it? A comment would be greatly appreciated. Thank you in advance for your help. Kim