无法将 "列表" 转换为 "字符串"

跪求大神看看我这个哪里出问题了，单纯想获取单号粘贴至相应的网站上循环操作

问题提示：File "<string>", line 21, in _invoke

File "<string>", line 858, in _invoke
File "<string>", line 118, in execute
File "<string>", line 92, in execute
xbot.errors.UIAError: Can not convert Array to String.