Okay, theres definitely something wrong with the links.  I'd like you to re-run the setup script, but to do so, you have to delete the link files and the .firsttime file that tells the setup script whether to generate the links or not.  To do this, you will need to run (from the PESTICA distribution directory) "rm .firsttime resp_mean_mni.nii card_mean_mni.nii".  That will delete the two link files and the .firsttime file.  Then run ./setup_pestica.sh to re-make the links.  From this directory, test the link by running "3dinfo resp_mean_mni.nii".  That ought to work, but if it doesn't there may be some permissions issue specific to your computing setup.  If that doesn't work, post the output of "ls -l" on the PESTICA dir and the pestica_volumes subdirectory.
erik