All com.android.support libraries must use the exact same version specification (mixing versions can lead to runtime crashes). Found versions 27.1.0, 27.0.2. Examples include com.android.support:animated-vector-drawable:27.1.0 and com.android.support:cardview-v7:27.0.2 less... (Ctrl+F1)
There are some combinations of libraries, or tools and libraries, that are incompatible, or can lead to bugs. One such incompatibility is compiling with a version of the Android support libraries that is not the latest version (or in particular, a version lower than your targetSdkVersion).
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