zgbl改良机器人问题，帮忙看看
zgbl 师兄，领悟的时候经常在和尚院一部发呆，为什么啊？另外还出现下面的错误：
Run-time error
World: 领悟技能
Immediate execution
:288: attempt to concatenate field '?' (a nil value)
stack traceback:
:288: in function 'draw_window'
:5: in main chunk
脚本错误处的上下文:
284 : ColourNameToRGB ("red"), -- colour
285 : false) -- not Unicode
286 :
287 : for i = 1,#_basic do
288*:local txt = _skills_ch.."(".._basic.."):".._skills_lev
289 :local _high = i*20+5
290 :WindowText (win, "f1",
291 : txt, -- text
292 : 5, _high, 0, 0, -- rectangle
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