android kotlin编译的报错提示：
:app:compileDebugKotlin
Supertypes of the following classes cannot be resolved. Please make sure you have the required dependencies in the classpath:
MainActivity.kt
Cannot access 'android.support.v4.view.ViewPager.OnPageChangeListener' which is a supertype of 'com.youth.banner.Banner'. Check your module classpath for missing or conflicting dependencies
Cannot access 'android.support.v4.view.ViewPager.OnPageChangeListener' which is a supertype of 'com.youth.banner.Banner'. Check your module classpath for missing or conflicting dependencies
Cannot access 'android.support.v4.view.ViewPager.OnPageChangeListener' which is a supertype of 'com.youth.banner.Banner'. Check your module classpath for missing or conflicting dependencies
Cannot access 'android.support.v4.view.ViewPager.OnPageChangeListener' which is a supertype of 'com.youth.banner.Banner'. Check your module classpath for missing or conflicting dependencies
Cannot access 'android.support.v4.view.ViewPager.OnPageChangeListener' which is a supertype of 'com.youth.banner.Banner'. Check your module classpath for missing or conflicting dependencies
Cannot access 'android.support.v4.view.ViewPager.OnPageChangeListener' which is a supertype of 'com.youth.banner.Banner'. Check your module classpath for missing or conflicting dependencies
Cannot access 'android.support.v4.view.ViewPager.OnPageChangeListener' which is a supertype of 'com.youth.banner.Banner'. Check your module classpath for missing or conflicting dependencies
Cannot access 'android.support.v4.view.ViewPager.OnPageChangeListener' which is a supertype of 'com.youth.banner.Banner'. Check your module classpath for missing or conflicting dependencies
Cannot access 'android.support.v4.view.ViewPager.OnPageChangeListener' which is a supertype of 'com.youth.banner.Banner'. Check your module classpath for missing or conflicting dependencies
org.gradle.api.GradleException: Compilation error. See log for more details
并且代码编译错误：
解决问题，在gradle.properties中添加一句：android.enableJetifier=true