Too Many Input Arguments for Screen

1
Hello:
I am getting the following error message when trying to run Screen:
??? Error using ==> Screen
Too many input arguments.

Error in ==> /Applications/MATLAB6p5p1/practice/Tiling.m
On line 19 ==> window=Screen(screenNumber,'OpenWindow',[ ],[ ],8);


As a consequence, many of the demo programs are not working also. What is
the best way to remedy this?

I am using:
Mac OSX (10.2).
MatLab Version 6.5.1.200223 Release 13 (Service Pack 1)
PsychoToolBox version 2.53 12 August 2002.

I just installed CodeWarrior version 7 but is having problems compiling
Screen.u. Error 3314: Could not find or load the file "VideoToolbox.h" for
target "Screen.ppc" for project Screen.u. The same for CheckConfig.c,
MatToCSpecArray.c and Dialogs.c.

Thanks,
Dorothy