The import statement is not recognized by Android Studio.

We are currently developing an Android app. Even though it is imported on the library class, the import statement is not reflected and it is in the red as follows:

As a result, the gradle syncs, but when I try to run the app, I get an error.
If you know what's causing it, could you tell me?

*Import is in the specified folder as follows (the contents are also public and accessible from the outside)

*I tried the following solution, but it didn't work

·file->Invalidate Caches/Restart

·Delete the Library folder under the idea folder of the project→invalidate Cache/Restart

·Close Project ->Open an existing android studio project

バージョンVersion information

Android Studio: 3.5.1 Gradle: 5.4.1
Gradle Plugin: 3.5.1

*build.gradle (below app) (posted just in case)

Thank you for your cooperation.