How to find issue Android SDK 3.0 Error:(9, 5) error: resource android:attr/colorError not found

Question

How to find issue to this error when I did a make I have got this error message : Error:(9, 5) error: resource android:attr/colorError not found

Thing strange I've 2 build.gradle files : Here my build.gradle (Project:Projectname) File :

buildscript {
    repositories {
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.0.0'

        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        jcenter()
        maven {
            url "https://maven.google.com"
        }
    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

Here my build.gradle (Module:app) File :

apply plugin: 'com.android.application'
android {
    compileSdkVersion 22
    defaultConfig {
        applicationId "org.acme.nfcedit"
        minSdkVersion 22
        targetSdkVersion 26
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
    productFlavors {
    }
}

dependencies {
    implementation fileTree(include: ['*.jar'], dir: 'libs')
    implementation 'com.android.support:appcompat-v7:26.1.0'
    implementation 'com.android.support.constraint:constraint-layout:1.0.2'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.1'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.1'
}

This file appears /home/users/.gradle/caches/transforms-1/files-1.1/appcompat-v7-26.1.0.aar/c41e5bc4d98504dc222d4eca88ab6d1b/res/values-v26/values-v26.xml content

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <style name="Base.Theme.AppCompat" parent="Base.V26.Theme.AppCompat"/>
    <style name="Base.Theme.AppCompat.Light" parent="Base.V26.Theme.AppCompat.Light"/>
    <style name="Base.V26.Theme.AppCompat" parent="Base.V26.Theme.AppCompat">
        <!-- We can use the platform styles on API 26+ -->
        <item name="colorError">?android:attr/colorError</item>
    </style>
    <style name="Base.V26.Theme.AppCompat.Light" parent="Base.V23.Theme.AppCompat.Light">
        <!-- We can use the platform styles on API 26+ -->
        <item name="colorError">?android:attr/colorError</item>
    </style>
    <style name="Base.V26.Widget.AppCompat.Toolbar" parent="Base.V7.Widget.AppCompat.Toolbar">
        <item name="android:touchscreenBlocksFocus">true</item>
        <item name="android:keyboardNavigationCluster">true</item>
    </style>
    <style name="Base.Widget.AppCompat.Toolbar" parent="Base.V26.Widget.AppCompat.Toolbar"/>
</resources>

I don't know what's mmeaning ?android:attr/colorError

Thanks

Answer 1

The attribute named "android:attr/colorError" is referenced by the appcompat library at API 26 and above. But the build is compiling with sdk version 22.

So, inside your app module's build.gradle, increase your compileSdkVersion to 26 to make it agree with the version of the appcompat library you are using.

In other words, right now, you have:

compileSdkVersion 22
implementation 'com.android.support:appcompat-v7:26.1.0'

But, those two versions should be in agreement. So, see what happens with:

compileSdkVersion 26
implementation 'com.android.support:appcompat-v7:26.1.0'

Answer 2

Change compileSdkVersion 22 to compileSdkVersion 26.