I rebuild an existing project in Android Studio and the following error occurs

1: Task failed with an exception.
-----------
* What went wrong:
Execution failed for task ':app:dataBindingMergeDependencyArtifactsDebug'.
> Could not resolve all files for configuration ':app:debugRuntimeClasspath'.
   > Could not find com.google.android.exoplayer:exoplayer:2.11.4.
     Searched in the following locations:
       - https://dl.google.com/dl/android/maven2/com/google/android/exoplayer/exoplayer/2.11.4/exoplayer-2.11.4.pom
       - https://jcenter.bintray.com/com/google/android/exoplayer/exoplayer/2.11.4/exoplayer-2.11.4.pom
       - https://repo.maven.apache.org/maven2/com/google/android/exoplayer/exoplayer/2.11.4/exoplayer-2.11.4.pom
       - https://jitpack.io/com/google/android/exoplayer/exoplayer/2.11.4/exoplayer-2.11.4.pom
     Required by:
         project :app > com.github.HamidrezaAmz:MagicalExoPlayer:1.0.16

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.
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I did the followings but it didn’t solve the problem:

• added this to build.gradle :

allprojects {
       repositories {
            maven { url 'https://jitpack.io' }
        }
    }

• Also added this to build.gradle according to this:

allprojects {
    repositories {
        maven { url 'https://google.bintray.com/exoplayer/' }
        maven { url 'https://dl.bintray.com/android/android-tools' }
        maven { url 'https://dl.bintray.com/firebase/gradle/' }
        google()
        jcenter()
        mavenCentral()
        maven { url "https://jitpack.io" }
        flatDir {
            dirs 'libs'
        }
    }
}