Pychorm提示Unresolved reference 导入模块报错

最近使用Pychorm编写Python时，每次要引入自定义模块，就会报错，提示“Unresolved reference”

Unresolved reference 'LoginClass' more... (Ctrl+F1) 

This inspection detects names that should resolve but don't. Due to dynamic dispatch and duck typing, this is possible in a limited but useful number of cases. Top-level and class-level items are supported better than instance items.

百度试了很多方法，结果都没用，最后很简单用一步就解决了，大家都可以试试

右击被调用模块存在的文件夹，“MarkDictionary as”-->“Sources root”

再次查看，报错消失了。