As error:

AAPT: error: resource android:attr/colorError not found.

Solutions:
1 build.gradle Set as follows:

apply plugin: 'com.android.application'

android {
    compileSdkVersion 26
    buildToolsVersion "29.0.2"

    defaultConfig {
        applicationId "com.lgl.answersystem"
        minSdkVersion 15
        targetSdkVersion 26
        versionCode 1
        versionName "1.0"
    }

Later, an error was reported

AAPT: error: resource android:attr/dialogCornerRadius not found.

terms of settlement:

apply plugin: 'com.android.application'

android {
    compileSdkVersion 28
    buildToolsVersion "29.0.2"

    defaultConfig {
        applicationId "com.lgl.answersystem"
        minSdkVersion 15
        targetSdkVersion 28
        versionCode 1
        versionName "1.0"
    }