# Problems with AssertOpenGL

**URL:** <https://psychtoolbox.discourse.group/t/problems-with-assertopengl/2043>\
**Category:** Uncategorized\
**Created:** [January 15, 2009, 12:28am UTC](https://psychtoolbox.discourse.group/t/problems-with-assertopengl/2043 "2009-01-15T00:28:26Z")\
**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:** [January 15, 2009, 12:28am UTC](https://psychtoolbox.discourse.group/t/problems-with-assertopengl/2043/1 "2009-01-15T00:28:26Z")

</div>

I downloaded PTB-3.0.8 onto a Windows XP machine running Matlab 7.4   
with an NVIDIA geforce4 4200 Go graphics card. When the post-  
installation routines attempt to run I receive the following error:  
??? Error using ==\> AssertOpenGL at 54  
This script or function is designated to run only an Psychtoolbox based   
on OpenGL. See AssertOpenGL.  
  
Error in ==\> PsychtoolboxRegistration at 59  
AssertOpenGL;  
  
Error in ==\> PsychtoolboxPostInstallRoutine at 93  
PsychtoolboxRegistration(isUpdate, flavor);  
  
Error in ==\> UpdatePsychtoolbox at 157  
 PsychtoolboxPostInstallRoutine(1);  
  
Any ideas?  
  
Thanks,  
Ian