# 3.0.10 error Win7 Matlab R2013a - invalid MEX-File error for MatlabWindowsFilesR2007a\Screen.mexw64 **URL:** \ **Category:** Uncategorized\ **Created:** [June 5, 2013, 12:45am UTC](https://psychtoolbox.discourse.group/t/3-0-10-error-win7-matlab-r2013a-invalid-mex-file-error-for-matlabwindowsfilesr2007a-92-screen-mexw64/320 "2013-06-05T00:45:58Z")\ **Posts on this page:** 3\ **Page:** 1
**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:** [June 5, 2013, 12:45am UTC](https://psychtoolbox.discourse.group/t/3-0-10-error-win7-matlab-r2013a-invalid-mex-file-error-for-matlabwindowsfilesr2007a-92-screen-mexw64/320/1 "2013-06-05T00:45:58Z")
Hi there,   I know this question has been asked many times here, but I can’t seem to fix this on my own.   I can’t get PsychToolbox working on my Windows 7 Machine with Matlab R2013a. When I run AssertOpenGL I get an invalid MEX-File error for MatlabWindowsFilesR2007a\Screen.mexw64.   I’m running the latest release of PsychToolbox (3.0.10 - Flavor: beta - Corresponds to SVN Revision 3833) in Windows 7 running Matlab R2013a.   I’ve also installed the supplied vcredist\_x64.exe   I’ve copied all the errors and versions in detail below.   Some help would be greatly appreciated!   Thank you ;)   Steven.           > \>\> AssertOpenGL   A very simple test call to the Screen() MEX file failed in AssertOpenGL, indicating that either Screen is totally dysfunctional, or you are trying to run your script on a system without Psychtoolbox-3 properly installed - or not installed at all.   This script or function is designated to run only an Psychtoolbox based on OpenGL. Read "help  AssertOpenGL" for more info.   A first more diagnostic test would be to simply type Screen in your Matlab/Octave console and check what its output is.   The returned error message by Matlab/Octave was: Last Error: Invalid MEX-file '\\...\PsychBasic\MatlabWindowsFilesR2007a\Screen.mexw64': The specified module could not be found. (MATLAB:invalidMEXFile)     \\...\PsychOneliners\AssertOpenGL.m,99   Error using AssertOpenGL (line 174) Problems detected in call to AssertOpenGL;   > \>\> Screen Invalid MEX-file '\\is-fs1a\Users\smanos\Desktop\Psych\toolbox\Psychtoolbox\PsychBasic\MatlabWindowsFilesR2007a\Screen.mexw64': The specified module could not be found.     \*\*\* PsychtoolboxVersion \*\*\*   > \>\> PsychtoolboxVersion   ans =   3.0.10 - Flavor: beta - Corresponds to SVN Revision 3833 For more info visit: [https://github.com/Psychtoolbox-3/Psychtoolbox-3](https://github.com/Psychtoolbox-3/Psychtoolbox-3)   \*\*\* Windows Version 7 \*\*\*   C:\Users\smanos\>Ver   Microsoft Windows [Version 6.1.7601]     \*\*\* Matlab Version \*\*\*   > \>\> version   ans =   8.1.0.604 (R2013a)   ---
**Author:** ![xrli2002](https://avatars.discourse-cdn.com/v4/letter/x/48db29/32.png) [@xrli2002](https://psychtoolbox.discourse.group/u/xrli2002)\ **Post date:** [June 5, 2013, 2:15am UTC](https://psychtoolbox.discourse.group/t/3-0-10-error-win7-matlab-r2013a-invalid-mex-file-error-for-matlabwindowsfilesr2007a-92-screen-mexw64/320/2 "2013-06-05T02:15:00Z")
Have you installed GStreamer? -Xiangrui > --- In [psychtoolbox@yahoogroups.com](mailto:psychtoolbox@yahoogroups.com), Steven Manos \ wrote: > \> > \> Hi there, > \> > \> I know this question has been asked many times here, but I can't seem to fix this on my own. > \> > \> I can't get PsychToolbox working on my Windows 7 Machine with Matlab R2013a. When I run AssertOpenGL I get an invalid MEX-File error for MatlabWindowsFilesR2007a\Screen.mexw64. > \> > \> I'm running the latest release of PsychToolbox (3.0.10 - Flavor: beta - Corresponds to SVN Revision 3833) in Windows 7 running Matlab R2013a. > \> > \> I've also installed the supplied vcredist\_x64.exe > \> > \> I've copied all the errors and versions in detail below. > \> > \> Some help would be greatly appreciated! > \> > \> Thank you ;) > \> > \> Steven. > \> > \> > \> > \> > \> > \> \>\> AssertOpenGL > \> > \> A very simple test call to the Screen() MEX file failed in AssertOpenGL, indicating > \> that either Screen is totally dysfunctional, or you are trying to run your script on > \> a system without Psychtoolbox-3 properly installed - or not installed at all. > \> > \> This script or function is designated to run only an Psychtoolbox based on OpenGL. Read "help AssertOpenGL" for more info. > \> > \> A first more diagnostic test would be to simply type Screen in your Matlab/Octave console and check what its output is. > \> > \> The returned error message by Matlab/Octave was: > \> Last Error: Invalid MEX-file '\\...\PsychBasic\MatlabWindowsFilesR2007a\Screen.mexw64': The specified module could not be found. (MATLAB:invalidMEXFile) > \> \\...\PsychOneliners\AssertOpenGL.m,99 > \> > \> Error using AssertOpenGL (line 174) > \> Problems detected in call to AssertOpenGL; > \> > \> \>\> Screen > \> Invalid MEX-file '\\is-fs1a\Users\smanos\Desktop\Psych\toolbox\Psychtoolbox\PsychBasic\MatlabWindowsFilesR2007a\Screen.mexw64': The > \> specified module could not be found. > \> > \> > \> \*\*\* PsychtoolboxVersion \*\*\* > \> > \> \>\> PsychtoolboxVersion > \> > \> ans = > \> > \> 3.0.10 - Flavor: beta - Corresponds to SVN Revision 3833 > \> For more info visit: > \> [https://github.com/Psychtoolbox-3/Psychtoolbox-3](https://github.com/Psychtoolbox-3/Psychtoolbox-3) > \> > \> \*\*\* Windows Version 7 \*\*\* > \> > \> C:\Users\smanos\>Ver > \> > \> Microsoft Windows [Version 6.1.7601] > \> > \> > \> \*\*\* Matlab Version \*\*\* > \> > \> \>\> version > \> > \> ans = > \> > \> 8.1.0.604 (R2013a) > \> ---
**Author:** ![xeos](https://avatars.discourse-cdn.com/v4/letter/x/ecae2f/32.png) [@xeos](https://psychtoolbox.discourse.group/u/xeos)\ **Post date:** [June 5, 2013, 3:49am UTC](https://psychtoolbox.discourse.group/t/3-0-10-error-win7-matlab-r2013a-invalid-mex-file-error-for-matlabwindowsfilesr2007a-92-screen-mexw64/320/3 "2013-06-05T03:49:14Z")
This is just a wild guess, but it might work better if it was installed locally and not on a network share. Can you try putting it on c:\toolbox just for testing purposes? > On Tue, Jun 4, 2013 at 5:45 PM, Steven Manos \<[smanos@...](mailto:smanos@...)\> wrote: > > > Hi there, > > > > I know this question has been asked many times here, but I can’t seem to fix this on my own. > > > > I can’t get PsychToolbox working on my Windows 7 Machine with Matlab R2013a. When I run AssertOpenGL I get an invalid MEX-File error for MatlabWindowsFilesR2007a\Screen.mexw64. > > > > I’m running the latest release of PsychToolbox (3.0.10 - Flavor: beta - Corresponds to SVN Revision 3833) in Windows 7 running Matlab R2013a. > > > > I’ve also installed the supplied vcredist\_x64.exe > > > > I’ve copied all the errors and versions in detail below. > > > > Some help would be greatly appreciated! > > > > Thank you ;) > > > > Steven. > > > > \>\> AssertOpenGL > > > > A very simple test call to the Screen() MEX file failed in AssertOpenGL, indicating > > > > that either Screen is totally dysfunctional, or you are trying to run your script on > > > > a system without Psychtoolbox-3 properly installed - or not installed at all. > > > > This script or function is designated to run only an Psychtoolbox based on OpenGL. Read "help AssertOpenGL" for more info. > > > > A first more diagnostic test would be to simply type Screen in your Matlab/Octave console and check what its output is. > > > > The returned error message by Matlab/Octave was: > > > > Last Error: Invalid MEX-file '\\...\PsychBasic\MatlabWindowsFilesR2007a\Screen.mexw64': The specified module could not be found. (MATLAB:invalidMEXFile) > > > > \\...\PsychOneliners\AssertOpenGL.m,99 > > > > Error using AssertOpenGL (line 174) > > > > Problems detected in call to AssertOpenGL; > > > > \>\> Screen > > > > Invalid MEX-file '\\is-fs1a\Users\smanos\Desktop\Psych\toolbox\Psychtoolbox\PsychBasic\MatlabWindowsFilesR2007a\Screen.mexw64': The > > > > specified module could not be found. > > > > \*\*\* PsychtoolboxVersion \*\*\* > > > > \>\> PsychtoolboxVersion > > > > ans = > > > > 3.0.10 - Flavor: beta - Corresponds to SVN Revision 3833 > > > > For more info visit: > > > > [https://github.com/Psychtoolbox-3/Psychtoolbox-3](https://github.com/Psychtoolbox-3/Psychtoolbox-3) > > > > \*\*\* Windows Version 7 \*\*\* > > > > C:\Users\smanos\>Ver > > > > Microsoft Windows [Version 6.1.7601] > > > > \*\*\* Matlab Version \*\*\* > > > > \>\> version > > > > ans = > > > > 8.1.0.604 (R2013a)