我自己的话给Netlogo带来了错误

Question

使用“我自己”一词时，Netlogo出现问题 这是我在项目中使用的代码

    ask players [
          if ([owner] of the-ball != nobody) [
            ifelse([team] of ([owner] of the-ball) = [team] of myself and (myself != [target] of the-ball) )[
              set team-have-ball? true
            ] [
              set team-have-ball? false
            ]
          ]
]

错误提示MYSELF没有代理可参考。