Error : Program type already present: android.support.design.widget.CoordinatorLayout$Behavior

It worked when I downgrade the support appcompat gradle dependency, like follwing :

implementation 'com.android.support:appcompat-v7:27.0.2'

previously it was

implementation 'com.android.support:appcompat-v7:27.1.0'

Also this can be fixed by just adding support design dependency of version 27.1.0 or above to your app level build.gradle as following :

implementation 'com.android.support:design:27.1.0'

I faced the same problem, I added android support design dependencies to the app level build.gradle

Add following:

implementation 'com.android.support:design:27.1.0'

in build.gradle. Now its working for me.

It might be cause of a library, I faced it because of Glide.

It was

implementation 'com.github.bumptech.glide:glide:4.7.1'

So I added exclude group: "com.android.support" And it becomes

implementation ('com.github.bumptech.glide:glide:4.7.1') {
        exclude group: "com.android.support"
    }

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