You have set minimal SDK on your project is API 23 (marshmallow) and your device or emulator has SDK(API 19, Kitkat). Just go to build.gradle(Module:app) and change minSdkVersion:
android {
compileSdkVersion 26
buildToolsVersion "26.0.1"
defaultConfig {
applicationId "YOUR PACKAGE"
minSdkVersion 17 //change here
targetSdkVersion 26
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
multiDexEnabled true
}