Make all libraries to use same support libs version (26.1.0 in this case) - place it in your root build.gradle (I placed in build script)

gistfile1.txt

    subprojects {
        project.configurations.all {
            resolutionStrategy.eachDependency { details ->
                if (details.requested.group == 'com.android.support'
                        && !details.requested.name.contains('multidex') ) {
                    details.useVersion "26.1.0"
                }
            }
        }
    }