Scala Error: Could not find or load main class in both Scala IDE and Eclipse

I think this should be your folder structure

Scala0
└── src
    └── main
        └── scala
            └── com.ks.sparkscala
                └── FriendsByAge

In your case create a folder main/scala inside src and copy the package inside it.

Please follow here for the project structure

I hope this helped!

In the eclipse -->project properties-->scala compiler ---> change the scala installation.

It is working for me .

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