# Re: Psychtoolbox 2.51 Available Now

**URL:** <https://psychtoolbox.discourse.group/t/re-psychtoolbox-2-51-available-now/1317>\
**Category:** Uncategorized\
**Created:** [July 12, 2002, 4:30pm UTC](https://psychtoolbox.discourse.group/t/re-psychtoolbox-2-51-available-now/1317 "2002-07-12T16:30:04Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![ingling7](https://avatars.discourse-cdn.com/v4/letter/i/e79b87/32.png) [@ingling7](https://psychtoolbox.discourse.group/u/ingling7)\
**Post date:** [July 12, 2002, 4:30pm UTC](https://psychtoolbox.discourse.group/t/re-psychtoolbox-2-51-available-now/1317/1 "2002-07-12T16:30:04Z")

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Ken Knoblauch wrote:  
  

> \>Hi,  
> \>  
> \>Installation seems to have proceeded correctly but at MatLab startup, it  
> \>gives the following  
> \>errors:  
> \>  
> \>Directory access failure: Macintosh HD:MATLAB  
> \>5:Toolbox:PsychToolbox:PsychCalData:  
> \>Directory access failure: Macintosh HD:MATLAB  
> \>5:Toolbox:PsychToolbox:PsychHardware:SERIALCMETER:  
> \>Directory access failure: Macintosh HD:MATLAB  
> \>5:Toolbox:PsychToolbox:PsychScripts:  
> \>  
> \>Initially, I noted that a part of path had a small letter substituted  
> \>for a capital, ie, Psychtoolbox  
> \>for PsychToolBox and so I fixed that but since the 3 leaves of the  
> \>directory tree are not  
> \>present, I get these messages anyway. It's quite possible that these  
> \>subdirectories are  
> \>unnecessary and not needed for anything that I would do on my system,  
> \>but is there a  
> \>switch that would allow me to let MatLab ignore their absence. The  
> \>other alternative is  
> \>that they are necessary and then why aren't they in the distribution.  
> \>  
> \>If they are unnecessary, do I just change the matlabpath?  
> \>  
> \>thanks and sorry to bother you about a surely trivial point.  
> \>  
> \>best,  
> \>  
> \>Ken  
> \>   
> \>

Dear Ken,  
  
We renamed some of the folders under the Psychtoolbox folder at   
Psychtoolbox version 2.5. The error messages result from obsolete   
directory names in your Matlab path settings. There is a complementary   
set of errors which you should also expect, errors resulting from   
Matlab not finding those Psychtoolbox scripts located along new paths   
not specified by your old path settings.   
  
As you guessed, all that is necessary is to change the Matlab path. In   
Mac Matlab, the simplest way to do that is to use the "default path"   
button in the Matlab path window. That will both exclude the obsolete   
paths and include the new ones.   
  
Best,  
  
Allen