Couldn't save uncommitted changes.

关于idea切换分支报错的问题。

Couldn't save uncommitted changes.
Tried to save uncommitted changes in stash before Update, but failed with an error.
stash file://E:/Users/zkj/IdeaProjects/mps: unable to auto-detect email address (got 'zkj@DESKTOP-8HT89AC.(none)')
Cannot save the current index state

原因是你没有输入账号和密码。你可以修改当前分支一个文件，然后再提交一下，idea就会提示你输入账号和密码。