Use the android support libraries from the google repos rather than sdk.

app/build.gradle

@@ -117,10 +117,10 @@ dependencies {
     implementation "ch.acra:acra-mail:$acraVersion"
     implementation "ch.acra:acra-toast:$acraVersion"
 
-    compile 'com.android.support:appcompat-v7:26.+'
-    compile 'com.android.support:cardview-v7:26.+'
-    compile 'com.android.support:design:26.+'
-    compile 'com.android.support:preference-v14:26.+'
+    implementation 'com.android.support:appcompat-v7:27.1.0'
+    implementation 'com.android.support:cardview-v7:27.1.0'
+    implementation 'com.android.support:design:27.1.0'
+    implementation 'com.android.support:preference-v14:27.1.0'
 
     compile 'com.github.yukuku:ambilwarna:2.0.1'
     compile ('com.github.worker8:tourguide:1.0.17-SNAPSHOT@aar'){