problem installing Psychtoolbox

This is the error I’m getting trying to install Psychtoolbox,

I can’t figure out what I’m doing wrong.

 

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You can now use your newly installed 'beta'-flavor Psychtoolbox. Enjoy!

Whenever you want to upgrade your Psychtoolbox to the latest 'beta' version, just

run the UpdatePsychtoolbox script.

 

Error: File: PsychtoolboxPostInstallRoutine.m Line: 416 Column: 23

The input character is not valid in MATLAB statements or expressions.

 

Error in DownloadPsychtoolbox (line 843)

   PsychtoolboxPostInstallRoutine(0, flavor);