An attempt was made to create a graphics window when the maximum number of windows were already defined. (The V+ system uses two windows for the screen and the top status line. Every title bar menu bar and scroll bar is a separate window. The pull-down window is always allocated even if it is not visible. Systems with AdeptVision always have the vision-training window allocated.) Where possible change your window definitions to omit menu bars and scroll bars. If necessary use the utility program CONFIG_C to increase the number of window buffers.