Hi, I'm trying to follow the tutorials and as it would happen I am getting the same (or at least a similar) error after trying to set up the cursor for the room editor. I'm not sure if you're still active on here but any bit of help would be greatly appreciated!
Variable <unknown_object>.drawsprite(100014, -2147483648) not set before reading it.
at gml_Object_obj_editor_Draw_0 (line 22) - drawsprite(spr_cursor, 0, draw_x, draw_y);