Changed ValueError message
@@ -1020,7 +1020,7 @@ class BaseWindow(with_metaclass(_WindowMetaclass, EventDispatcher)):
if self._fullscreen:
raise WindowException('Cannot set size of fullscreen window.')
if width < 1 or height < 1:
- raise ValueError('width and height must both be positive integers')
+ raise ValueError('width and height must be positive integers')
self._width, self._height = width, height
