# Install on a Maverick Mac **URL:** \ **Category:** Uncategorized\ **Created:** [September 30, 2014, 5:59am UTC](https://psychtoolbox.discourse.group/t/install-on-a-maverick-mac/237 "2014-09-30T05:59:49Z")\ **Posts on this page:** 3\ **Page:** 1
**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:** [September 30, 2014, 5:59am UTC](https://psychtoolbox.discourse.group/t/install-on-a-maverick-mac/237/1 "2014-09-30T05:59:49Z")
Hello All, I use psychtoolbox in few computers and it all works fine. Today I wanted to install it on a new macbook and simply couldn't make it work. Matlab 2011b is install and working (I had to install quartz) I download the downloadpsychtoolbox.m file from the site, but running the file fire the following message: Error: File: DownloadPsychtoolbox.m Line: 1 Column: 9 The input character is not valid in MATLAB statements or expressions. I then tried: DownloadPsychtoolbox('/Applications') which fired the same error. Please Help! Thanks, Yaakov. ---
**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:** [September 30, 2014, 9:06am UTC](https://psychtoolbox.discourse.group/t/install-on-a-maverick-mac/237/2 "2014-09-30T09:06:33Z")
Bonjour, Je viens d'installer la toolbox et j'ai une erreur(ci-dessous) lors d'un simple appel de la fonction Screen. Ma carte graphique est une Nvidia Qudro K610M. Comme indiqué dans l'aide (help SyncTrouble), j'ai essayé de changer le paramétrage de ma carte graphique mais sans succès ! Est-il nécessaire d'avoir une carte graphique de marque Intel ? ("If you use the NVidia or AMD proprietary graphics drivers, frequent synchronization failures, or other sync related warnings, or unsteady, irregularly timed flicker during PerceptualVBLSyncTest indicate that a desktop compositor is in use.") ----- ! PTB - ERROR: SYNCHRONIZATION FAILURE ! ---- One or more internal checks (see Warnings above) indicate that synchronization of Psychtoolbox to the vertical retrace (VBL) is not working on your setup. Bien cordialement, -- Fabien CLANCHE Ingénieur de recherche Faculté du Sport / EA 3450 - DevAH Université de Lorraine 30 rue du Jardin Botanique CS 30156 54603 Villers-lès-Nancy cedex mobile : 06 52 00 46 35 | tél : 03 83 68 29 05   ---
**Author:** ![mariokleiner](https://avatars.discourse-cdn.com/v4/letter/m/13edae/32.png) [@mariokleiner](https://psychtoolbox.discourse.group/u/mariokleiner)\ **Post date:** [October 1, 2014, 3:15pm UTC](https://psychtoolbox.discourse.group/t/install-on-a-maverick-mac/237/3 "2014-10-01T15:15:14Z")
Have you checked that the DownloadPsychtoolbox.m file is actually a valid M-File, and not some html webpage or such leading to the M-file? "Right click to save" is not the same as click to save. -mario