求助，关于显示验证的插件

wlkkz

Run-time error
Plugin: Show_fullme_CODE_v2_21 (called from world: 北大侠客行MUSHClient4.43绿色版)
Immediate execution
[string "Plugin"]:408: attempt to index global 'miniwin' (a nil value)
stack traceback:
        [string "Plugin"]:408: in function 'draw_mini_window_fill_by_png'
        [string "Plugin"]:197: in function 'show_fullme_code_from_web'
        [string "触发器: fullme_code_from_web"]:1: in main chunk
脚本错误处的上下文:
404 : -- loade .png image from memory's variable
405 :  WindowLoadImageMemory (win, "image1", png_buffer)
406 :
407 : -- draw the .png image file into the window
408*:  WindowDrawImage (win, "image1", 3, 3, -3, -43, miniwin.image_stretch)
409 :  
410 :  --内边框
411 :  WindowRectOp (win, 1, 3, 3, 303, 103, ColourNameToRGB("gray"))
412 :
请问这段是什么意思？

北大侠客行MUD，中国最好的MUD