afni.nimh.nih.gov

Why is there a 'BLOCK(2,1)' immediately after your -concat option? That's not good, at least. If I remove that from your command line, then things work better.

Also, your stim labels don't match what you are using in the -gltsym options (but that's not the cause of your error message, and would give another error message if the program got that far).