尝试启动Nightwatch Runner时发生错误

Question

我以前已经成功运行了测试，但是现在我遇到了这个错误。

An error occurred while trying to start the Nightwatch Runner: Invalid testing environment specified: chrome\. Available environments are: chrome, firefox, edge
       at Module._compile (internal/modules/cjs/loader.js:776:30)
       at Object.Module._extensions..js (internal/modules/cjs/loader.js:787:10)
       at Module.load (internal/modules/cjs/loader.js:653:32)
       at tryModuleLoad (internal/modules/cjs/loader.js:593:12)

我删除了Node目录并重新安装。我加了一个。在网络驱动程序路径的开头。