Error: Invalid Drawable?

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ImaginaryHuman

This piece of example code (not my actual app) produces the error:

SetGraphicsDriver GLGraphicsDriver()
GLGraphics (640,480,16,60,GRAPHICS_BACKBUFFER|GRAPHICS_STENCIL_BUFFER|GRAPHICS_ALPHABUFFER)

Whereas this piece of code is fine:

Graphics 640,480,16,60

However, this piece of code produces the error:

Graphics 640,480,16,60,GRAPHICS_BACKBUFFER|GRAPHICS_STENCILBUFFER|GRAPHICS_ALPHABUFFER

Somehow the flags perhaps are causing the error?

Also this piece of code is fine:

Graphics 640,480,16,60,GRAPHICS_BACKBUFFER
[code]
but this:
[code]
Graphics 640,480,16,60,GRAPHICS_BACKBUFFER|GRAPHICS_ALPHABUFFER

and this:

Graphics 640,480,16,60,GRAPHICS_BACKBUFFER|GRAPHICS_STENCILBUFFER

and this:

Graphics 640,480,16,60,GRAPHICS_BACKBUFFER|GRAPHICS_STENCILBUFFER|GRAPHICS_ALPHABUFFER

all do not work.