Cloning/updating Appium sample-code submodule
Command failed
stdout:
stderr:
fatal: Needed a single revision
Unable to find current revision in submodule path 'submodules/sample-code'
Warning: Command failed: git submodule update --init "E:\project\appium\submodules\sample-code"
fatal: Needed a single revision
Unable to find current revision in submodule path 'submodules/sample-code'
Use --force to continue.
出現此問題的原因是 git更新太慢，中間中斷過，解決辦法，刪掉sample-code文件夾或者里面的內容即可。