# about"Invalid mex-file "

**URL:** <https://psychtoolbox.discourse.group/t/about-quot-invalid-mex-file-quot/480>\
**Category:** Uncategorized\
**Created:** [October 25, 2011, 9:06am UTC](https://psychtoolbox.discourse.group/t/about-quot-invalid-mex-file-quot/480 "2011-10-25T09:06:35Z")\
**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:** [October 25, 2011, 9:06am UTC](https://psychtoolbox.discourse.group/t/about-quot-invalid-mex-file-quot/480/1 "2011-10-25T09:06:35Z")

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Hello!

I am not a native English speaker, so if there are some mistakes in my English, Please pardon me.

I have got a problem about the compatibility between Psychtoolbox and eyelink.

When I typed such as “Eyelink('GetTrackerVersion?')”in Matlab, it replied:” Invalid mex-file –(the path)-Eyelink.mexw32- the specified module could not be found”. I search for help in Q&A, there is a question about it, it says” Follow this link for details on how to solve this type of problems. But when I open that link, it appears” Sorry, "mex-error.html/mex-error.html.php" is an unknown handler”. ([http://psychtoolbox.org/eyelinktoolbox/mex-error.html](http://psychtoolbox.org/eyelinktoolbox/mex-error.html)) I do not know how to do.

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I have downloaded the latest PTB-3 and install it successfully. I also went to SR Research to download all four software in [https://www.sr-support.com/forums/showthread.php?t=15](https://www.sr-support.com/forums/showthread.php?t=15)

but I do not know how to install them and which one is useful.

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Thank you very much indeed! I will look forward to your reply!

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Shan