# Undefined function or variable 'PsychHID'.

**URL:** <https://psychtoolbox.discourse.group/t/undefined-function-or-variable-39-psychhid-39/686>\
**Category:** Uncategorized\
**Created:** [March 10, 2005, 10:41pm UTC](https://psychtoolbox.discourse.group/t/undefined-function-or-variable-39-psychhid-39/686 "2005-03-10T22:41:16Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![jiansongxu](https://avatars.discourse-cdn.com/v4/letter/j/67e7ee/32.png) [@jiansongxu](https://psychtoolbox.discourse.group/u/jiansongxu)\
**Post date:** [March 10, 2005, 10:41pm UTC](https://psychtoolbox.discourse.group/t/undefined-function-or-variable-39-psychhid-39/686/1 "2005-03-10T22:41:16Z")

</div>

Dear Friend:  
  
I'm playing with psychtoolbox and try to run the DrawSomeTextDemo.m, but get  
following error message:  
  
Undefined function or variable 'PsychHID'.  
  
  
I can run other demos. I'm using G5 Mac OSX  
  
Thanks  
  
Jiansong