Error:(6, 41) Unresolved reference: databinding Error:(17, 26) Unresolved reference: ActivityMainBinding Error:Execution failed for task ':app:compileDebugKotlin'. > Compilation error. See log for more details  

报错了~~wing大师，databinding和kotlin不兼容，修改app里面的build文件
在app build.gradle中添加如下代码即可解决 
kapt {
    generateStubs = true
}  

dependencies {
    //...
    kapt "com.android.databinding:compiler:2.3.0"
}