# Urgent Question

**URL:** https://psychtoolbox.discourse.group/t/urgent-question/356
**Category:** Uncategorized
**Created:** [April 29, 2013, 7:38pm UTC](https://psychtoolbox.discourse.group/t/urgent-question/356 "2013-04-29T19:38:04Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![Allen\_Ingling](https://avatars.discourse-cdn.com/v4/letter/a/a183cd/32.png) [@Allen\_Ingling](https://psychtoolbox.discourse.group/u/Allen_Ingling)
#### Post date: [April 29, 2013, 7:38pm UTC](https://psychtoolbox.discourse.group/t/urgent-question/356/1 "2013-04-29T19:38:04Z")

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Hi,  
  
Actually i am trying to install your toolbox on my machine, hoping that it can help me to make eye tracking regardless of the humans head position as in a frontal or side positions.  
  
I use Ubuntu 12.4 (32 bits and Matlab 32 bits) and i did all steps and when i tried to run the example (EyelinkImageExample), i found all the time this error:  
  
\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*  
Invalid MEX-file '/home/amir/Bureau/Psychotoolbox/Psychtoolbox/PsychBasic/Eyelink.mexglx':libeyelink\_core.so: the specified module is unfound  
\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*  
and on windows-7 (32 bits and matlab 32 bits), i got this error:  
  
\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*  
Invalid MEX-file 'C:\toolbox\Psychtoolbox\PsychBasic\MatlabWindowsFilesR2007a\Eyelink.mexw32': the specified module is unfouund  
\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*  
  
  
So could you please help me to overcome this problem which still unresolved?  
  
Also, concerning my main interest which is Eye Tracking program,,, is there an example to know how can i use your toolbox for this concern?  
  
Thanks alot,  
  
Sincerely  
  
Amir