GMLive works with my  other project. It doesnt use the window_set_cursor extension. This one does but if I try to run the server I get this error. Not sure exactly how they relate, not even sure what to search for.

Any idea what stupid thing im doing :]

EDIT: its the latest version, 2.3+

Creating an empty window_set_cursor.gml file in the extension’s directory should suffice - it would seem like GM consumed the empty file in process.