在路径中使用带$符号的字符时出错，我无法修复

Question

当我打开一个路径为“ ... xxx”的项目时，发生此错误。 $ _api。 xxx。'。

我点击了“修复”并删除了“ api”。它没有解决问题。

_api. is undefined. Fix it
    Path variables are used to substitute absolute paths in IDEA project files and allow project file sharing in version control systems.
    Some of the files describing the current project settings contain unknown path variables and IDEA cannot restore those paths.