ios+robota+appium打开程序报错，求助大佬

[weixin_40004566]

提示 An unknown server-side error occurred while processing the command. Original error: Could not create simulator with name 'appiumTest-48dc374e-89b8-4660-a250-2c2372409fff', device type id 'iphone 6s' and runtime id '11.0.1'. Reason: 'simctl error running 'create': Invalid device type: iphone 6s' 代码如下：Open Application http://0.0.0.0:4723/wd/hub platformName=ios platformVersion=11.0 deviceName=iphone 6s app=users:/zhuolipu/desktop/HeiZhimaApp 我是用的ios的模拟器，用命令行安装的appium 紧急求助各位大佬们，感激不尽