Hi, I'm analyzing fMRI data using freesurfer 5.0.0. I run into the following error when running selxavg3-sess. Any suggestions?

Thanks,
Eyal 

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edechter@ba7:~/projects/stability/analysis$ selxavg3-sess -s tower001 -d ../data/ -analysis tower_allruns -c unstable-stable -no-preproc 
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selxavg3-sess logfile is /u2/edechter/projects/stability/analysis/log/selxavg3-sess-bold-tower_allruns-101103112400.log
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/u2/edechter/projects/stability/data/tower001 
Wed Nov  3 11:24:01 EDT 2010
anadir = /u2/edechter/projects/stability/data/tower001/bold/tower_allruns
DoGLMFit = 1
DoContrasts = 1
UpdateNeeded = 1
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------- matlab output --------------------
Warning: Unable to open display 'iconic'.  You will not be able to display graphics on the screen.

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>> >> >> >> >> >> >> /software/Freesurfer/current/fsfast/toolbox/fast_selxavg3.m
>> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> $Id: fast_selxavg3.m,v 1.55.2.8 2009/04/17 20:09:46 greve Exp $
outtop = /u2/edechter/projects/stability/data
Extension format = nii
??? Undefined function or variable 'UseFloat'.

Error in ==> fast_selxavg3 at 82
fprintf('UseFloat = %d\n',UseFloat);

>> ------------------------------------------
ERROR: fast_selxavg3() failed\n
edechter@ba7:~/projects/stability/analysis$