# WIN: (eyelink) dll problems

**URL:** <https://psychtoolbox.discourse.group/t/win-eyelink-dll-problems/1017>\
**Category:** Uncategorized\
**Created:** [December 24, 2004, 1:14am UTC](https://psychtoolbox.discourse.group/t/win-eyelink-dll-problems/1017 "2004-12-24T01:14:07Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![franswcornelissen](https://avatars.discourse-cdn.com/v4/letter/f/df705f/32.png) [@franswcornelissen](https://psychtoolbox.discourse.group/u/franswcornelissen)\
**Post date:** [December 24, 2004, 1:14am UTC](https://psychtoolbox.discourse.group/t/win-eyelink-dll-problems/1017/1 "2004-12-24T01:14:07Z")

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Occasionally, there have been reports of people having problems getting   
the eyelink.dll toolbox (and as far as I remember also screen.dll) to   
work.  
They then get an error like this:  
  

> \>\>\> Unable to load mex file:  
> \>\> C:\MATLAB\toolbox\eyelinktoolbox\eyelinkbasic\eyelink.dll.  
> \>\>\> The specified module could not be found.  
> \>\>\>  
> \>\>\> ??? Invalid MEX-file

It seems Ronald van den Berg managed to find out (for XP at least) what   
the problem is. One of the issues is that it may not actually be the   
eyelink.dll (or screen.dll) that can't be found, but some other dll   
(such as the well known: efsadu.dll ;-0 ) on which the eyelink is   
depending (so much for matlab error reporting). Most of the times these   
dll's are installed, but occasionally not (apparently).  
  
Follow this link for details on how to possibly solve this type of   
problems if you ever encounter it.  
  
[http://www.psychtoolbox.org/eyelinktoolbox/mex-error.html](http://www.psychtoolbox.org/eyelinktoolbox/mex-error.html)  
  
Gr.  
  
  
Frans