# INTERNAL PSYCHTOOLBOX ERRORs when running PTB OSX Demos **URL:** \ **Category:** Uncategorized\ **Created:** [September 21, 2005, 10:58pm UTC](https://psychtoolbox.discourse.group/t/internal-psychtoolbox-errors-when-running-ptb-osx-demos/1436 "2005-09-21T22:58:00Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![sethegger1313](https://avatars.discourse-cdn.com/v4/letter/s/f17d59/32.png) [@sethegger1313](https://psychtoolbox.discourse.group/u/sethegger1313)\ **Post date:** [September 21, 2005, 10:58pm UTC](https://psychtoolbox.discourse.group/t/internal-psychtoolbox-errors-when-running-ptb-osx-demos/1436/1 "2005-09-21T22:58:00Z")
I am having some difficulty implementing any code using PTB and matlab; while trying to run scripts matlab returns error messages instead of the predicted results. Even more fustrating is the fact that the error messages all differ from one script to the next. Here are the error messages I am getting: 1. While running 'MovieDemoOSX' INTERNAL PSYCHTOOLBOX ERROR error: PsychError\_internal general description: Unspecified error, probably a Psychtoolbox bug specific description: Unrecognized screen depth value module name: Screen subfunction call: DrawText file name: ../../../Source/Common/Screen/ScreenTypes.c function name: PsychGetWhiteValueFromDepthStruct line number: 151 ??? (null) 2. While running 'DrawSomeTextOSX' INTERNAL PSYCHTOOLBOX ERROR error: PsychError\_internal general description: Unspecified error, probably a Psychtoolbox bug specific description: Error attempting to coerce color specifier module name: Screen subfunction call: FillRect file name: ../../../Source/Common/Screen/ScreenTypes.c function name: PsychCoerceColorModeFromSizes line number: 304 3. When Trying my own script: ----------------------------------------------- Segmentation violation detected at Wed Sep 21 15:19:10 2005 ----------------------------------------------- Configuration: MATLAB Version: 6.5.2.203039 (R13) Service Pack 2 Operating System: Darwin 7.9.0 Darwin Kernel Version 7.9.0: Wed Mar 30 20:11:17 PST 2005; root:xnu/xnu-517.12.7.obj~1/RELEASE\_PPC Power Macintosh Window System: The XFree86 Project, Inc (40300000), display:0.0 Current Visual: 0x22 (class 4, depth 15) Virtual Machine: Java 1.3.1\_16 with "Apple Computer, Inc." Java HotSpot(TM) Client VM (mixed mode) Segmentation violation occurred within signal handler. Unable to complete stack trace (stack was probably corrupted) This error was detected while a MEX-file was running. If the MEX-file is not an official MathWorks function, please examine its source code for errors. Please consult the External Interfaces Guide for information on debugging MEX-files. If it is an official MathWorks function, please follow these steps in reporting this problem to The MathWorks so that we have the best chance of correcting it: 1. Send this crash report to [segv@...](mailto:segv@...) for automated analysis. For your convenience, this information has been recorded in: /Users/psychophysics/matlab\_crash\_dump.415 2. Also, if the problem is reproducible, send the crash report to [support@...](mailto:support@...) along with: - A specific list of steps that will reproduce the problem - Any M, MEX, MDL or other files required to reproduce the problem - Any error messages displayed prior to this crash report A technical support engineer will contact you with further information. Thank you for your assistance. Please save your workspace and restart MATLAB before continuing your work. ??? (null) Even worse, running this script results in a Matlab Crashing and prompting me to restart before continuing to work in Matlab. Here is the script I am using: try whichScreen = 0; nCols = 320; nRows = 240; white=WhiteIndex(whichScreen); black=BlackIndex(whichScreen); gray=(white+black)/2; if round(gray)==white gray=black; end image1 = (rand(nRows,nCols)); tex = Screen('MakeTexture',whichScreen,image1\*gray); window = Screen('OpenWindow',whichScreen,0,[],32,2); Screen('FillRect',window,gray); Screen('Flip',window); Screen('FillRect',window,gray); Screen('CloseAll') catch Screen('CloseAll') rethrow(lasterror) end If I take out the call to Screen to 'MakeTexture' then the script no longer crashes. 4. DriftDemoOSX runs successfully without any complaint from matlab, despite the fact that it calls the same functions as the above scripts. I am currently running PsychToolbox v1.0.1 wiht Matlab 6.5.2 on a Dual 1.25 GHz G4 running OSX v10.3.9. If anyone has any insight into what is preventing me from running scripts successfully, I would much appreciate the help. Thanks for your time, Seth Egger ---
**Author:** ![mariokleiner](https://avatars.discourse-cdn.com/v4/letter/m/13edae/32.png) [@mariokleiner](https://psychtoolbox.discourse.group/u/mariokleiner)\ **Post date:** [September 22, 2005, 7:07pm UTC](https://psychtoolbox.discourse.group/t/internal-psychtoolbox-errors-when-running-ptb-osx-demos/1436/2 "2005-09-22T19:07:58Z")
Hi, please, always use the latest available release of the Psychtoolbox, especially if you experience trouble/bugs. Lots of bug-fixes and improvements are made in each new release, so your specific bug may be fixed already, and PTB 1.0.1 is over a year old! I would recommend you to download the 1.0.5 from the website and then downloading the update from: \<[http://www.kyb.tuebingen.mpg.de/bu/people/kleinerm/ptbosx/](http://www.kyb.tuebingen.mpg.de/bu/people/kleinerm/ptbosx/)\> Replace the Screen.mexmac of PTB 1.0.5 with the Screen.mexmac in the update and retry. Possible reasons for your crashes may be: 1. Using an ATI Rage Pro gfx-card -\> unsupported. 2. Running at a color depths other than "Millions of colors", which can cause malfunctions but is not detected by older PTB releases. A few comments to your script: The safest way is to first open an onscreen window: w=Screen('OpenWindow', .....) and then using the window handle 'w' for successive commands like Screen('MakeTexture', ...). Upcoming releases of PTB will require you to do it this way in exchange for a much faster, much more capable DrawTexture function :-) -mario --- In [psychtoolbox@yahoogroups.com](mailto:psychtoolbox@yahoogroups.com), "sethegger1313" \ wrote: > \> I am having some difficulty implementing any code using PTB and > \> matlab; while trying to > \> run scripts matlab returns error messages instead of the predicted > \> results. Even more > \> fustrating is the fact that the error messages all differ from one > \> script to the next. Here are the error messages I am getting: > \> > \> 1. While running 'MovieDemoOSX' > \> INTERNAL PSYCHTOOLBOX ERROR > \> error: PsychError\_internal > \> general description: Unspecified error, probably a Psychtoolbox bug > \> specific description: Unrecognized screen depth value > \> module name: Screen > \> subfunction call: DrawText > \> file name: ../../../Source/Common/Screen/ScreenTypes.c > \> function name: PsychGetWhiteValueFromDepthStruct > \> line number: 151 > \> ??? (null) > \> > \> 2. While running 'DrawSomeTextOSX' > \> INTERNAL PSYCHTOOLBOX ERROR > \> error: PsychError\_internal > \> general description: Unspecified error, probably a Psychtoolbox bug > \> specific description: Error attempting to coerce color specifier > \> module name: Screen > \> subfunction call: FillRect > \> file name: ../../../Source/Common/Screen/ScreenTypes.c > \> function name: PsychCoerceColorModeFromSizes > \> line number: 304 > \> > \> 3. When Trying my own script: > \> > \> ----------------------------------------------- > \> > \> Segmentation violation detected at Wed Sep 21 15:19:10 2005 > \> > \> ----------------------------------------------- > \> > \> > \> Configuration: > \> MATLAB Version: 6.5.2.203039 (R13) Service Pack 2 > \> Operating System: Darwin 7.9.0 Darwin Kernel Version 7.9.0: Wed > \> Mar 30 20:11:17 PST > \> 2005; root:xnu/xnu-517.12.7.obj~1/RELEASE\_PPC Power Macintosh > \> Window System: The XFree86 Project, Inc (40300000), > \> display:0.0 > \> Current Visual: 0x22 (class 4, depth 15) > \> Virtual Machine: Java 1.3.1\_16 with "Apple Computer, Inc." Java > \> HotSpot(TM) Client VM > \> (mixed mode) > \> > \> Segmentation violation occurred within signal handler. > \> Unable to complete stack trace (stack was probably corrupted) > \> > \> This error was detected while a MEX-file was running. If the > \> MEX-file > \> is not an official MathWorks function, please examine its source > \> code > \> for errors. Please consult the External Interfaces Guide for > \> information > \> on debugging MEX-files. > \> > \> If it is an official MathWorks function, please > \> follow these steps in reporting this problem to The MathWorks so > \> that we have the best chance of correcting it: > \> > \> 1. Send this crash report to segv@m... for automated > \> analysis. > \> For your convenience, this information has been recorded in: > \> /Users/psychophysics/matlab\_crash\_dump.415 > \> > \> 2. Also, if the problem is reproducible, send the crash report to > \> support@m... along with: > \> - A specific list of steps that will reproduce the problem > \> - Any M, MEX, MDL or other files required to reproduce the > \> problem > \> - Any error messages displayed prior to this crash report > \> A technical support engineer will contact you with further > \> information. > \> > \> Thank you for your assistance. Please save your workspace and > \> restart > \> MATLAB before continuing your work. > \> > \> ??? (null) > \> > \> Even worse, running this script results in a Matlab Crashing and > \> prompting me to restart > \> before continuing to work in Matlab. Here is the script I am using: > \> > \> try > \> whichScreen = 0; > \> nCols = 320; > \> nRows = 240; > \> > \> white=WhiteIndex(whichScreen); > \> black=BlackIndex(whichScreen); > \> gray=(white+black)/2; > \> if round(gray)==white > \> gray=black; > \> end > \> > \> image1 = (rand(nRows,nCols)); > \> > \> tex = Screen('MakeTexture',whichScreen,image1\*gray); > \> > \> window = Screen('OpenWindow',whichScreen,0,[],32,2); > \> > \> Screen('FillRect',window,gray); > \> Screen('Flip',window); > \> Screen('FillRect',window,gray); > \> > \> Screen('CloseAll') > \> > \> catch > \> Screen('CloseAll') > \> rethrow(lasterror) > \> end > \> > \> If I take out the call to Screen to 'MakeTexture' then the script no > \> longer crashes. > \> > \> 4. DriftDemoOSX runs successfully without any complaint from matlab, > \> despite the fact that it calls the same functions as the above > \> scripts. > \> > \> I am currently running PsychToolbox v1.0.1 wiht Matlab 6.5.2 on a > \> Dual 1.25 GHz G4 running OSX v10.3.9. If anyone has any insight into > \> what is > \> preventing me from running scripts successfully, I would much > \> appreciate the help. > \> > \> Thanks for your time, > \> Seth Egger