Idea left in project mode, the Project project catalog is not displayed, only a few configuration files

I, the cause of the problem is usually a configuration file *.iml error

II. Solutions
Method 1: Locate the error location, fix
Method 2: Clear the configuration, re-import
1) Close idea,
2) Delete the. Idea folder under the project folder
3) re-open the project with the Idea tool

I, the cause of the problem is usually a configuration file *.iml error

II. Solutions
Method 1: Locate the error location, fix
Method 2: Clear the configuration, re-import
1) Close idea,
2) Delete the. Idea folder under the project folder
3) re-open the project with the Idea tool