# Screen issue with Eyelink

**URL:** <https://psychtoolbox.discourse.group/t/screen-issue-with-eyelink/2989>\
**Category:** Uncategorized\
**Created:** [January 24, 2020, 6:06pm UTC](https://psychtoolbox.discourse.group/t/screen-issue-with-eyelink/2989 "2020-01-24T18:06:34Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![12bc10](https://avatars.discourse-cdn.com/v4/letter/1/b5a626/32.png) [@12bc10](https://psychtoolbox.discourse.group/u/12bc10)\
**Post date:** [January 24, 2020, 6:06pm UTC](https://psychtoolbox.discourse.group/t/screen-issue-with-eyelink/2989/1 "2020-01-24T18:06:34Z")

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I am a researcher in Canada who just updated some new computers in the lab running psychtoolbox with eyelink.

Info:  
psychtoolbox 3.0.16  
Windows 10  
Error present for all eyelink demos & custom code

Error code:  
EYELINK: WARNING! PsychEyelinkCallRuntime() Failed to call eyelink runtime callback function PsychEyelinkDispatchCallback [rc = 1]!  
EYELINK: WARNING! Make sure that function is on your Matlab/Octave path and properly initialized.  
EYELINK: WARNING! May also be an error during execution of that function. Type ple at command prompt for error messages.  
EYELINK: WARNING! Auto-Disabling all callbacks to the runtime environment for safety reasons.  
Eyelink: In PsychEyelink\_get\_input\_key(): Error condition detected: Trying to send TERMINATE\_KEY abort keycode!  
Eyelink: In PsychEyelink\_get\_input\_key(): Error condition detected: Trying to send TERMINATE\_KEY abort keycode!  
Error in function Rect: Usage error  
Argument was recognized as neither a window index nor a screen pointer

Running experiment on a 'EYELINK CL 4.594 ’ tracker.  
NVIDIA Corporation :: GeForce GT 710/PCIe/SSE2 :: 4.6.0 NVIDIA 432.00  
Matlab 64-Bit

Any help would be greatly appreciated 🙂

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<div class="post-metadata">

**Author:** ![Ian-Max-Andolina](https://yyz2.discourse-cdn.com/free1/user_avatar/psychtoolbox.discourse.group/ian-max-andolina/32/4_2.png) [@Ian-Max-Andolina](https://psychtoolbox.discourse.group/u/Ian-Max-Andolina)\
**Post date:** [January 25, 2020, 4:58am UTC](https://psychtoolbox.discourse.group/t/screen-issue-with-eyelink/2989/2 "2020-01-25T04:58:57Z")

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> [@12bc10](#):
>
> Error in function Rect: Usage error  
> Argument was recognized as neither a window index nor a screen pointer

Do other PTB demos work, as this error suggests a PTB error opening a window?