diff --git a/.circleci/config.yml b/.circleci/config.yml
index 28eac599..fc710f6c 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -2,7 +2,7 @@ version: 2
 jobs:
   build:
     docker:
-      - image: circleci/android:api-26-alpha
+      - image: circleci/android:api-27-alpha
     working_directory: ~/ultrasonic
     envoronment:
       JVM_OPTS: -Xmx3200m
diff --git a/dependencies.gradle b/dependencies.gradle
index ff608274..6c932026 100644
--- a/dependencies.gradle
+++ b/dependencies.gradle
@@ -1,6 +1,6 @@
 ext.versions = [
         minSdk               : 14,
-        targetSdk            : 23,
+        targetSdk            : 22,
         compileSdk           : 27,
         gradle               : '4.4.1',
 
@@ -12,7 +12,7 @@ ext.versions = [
         jacocoAndroid        : "0.1.2",
         buildVersioning      : "1.6.0",
 
-        androidSupport       : "23.4.0",
+        androidSupport       : "22.2.1",
 
         kotlin               : "1.2.10",
 
diff --git a/gradle.properties b/gradle.properties
new file mode 100644
index 00000000..68967e5e
--- /dev/null
+++ b/gradle.properties
@@ -0,0 +1,3 @@
+org.gradle.parallel=true
+org.gradle.configureondemand=true
+org.gradle.caching=true
\ No newline at end of file
diff --git a/ultrasonic/src/main/kotlin/org/moire/ultrasonic/subsonic/RestErrorMapper.kt b/ultrasonic/src/main/kotlin/org/moire/ultrasonic/subsonic/RestErrorMapper.kt
index 5d84442e..d4470f6f 100644
--- a/ultrasonic/src/main/kotlin/org/moire/ultrasonic/subsonic/RestErrorMapper.kt
+++ b/ultrasonic/src/main/kotlin/org/moire/ultrasonic/subsonic/RestErrorMapper.kt
@@ -21,7 +21,7 @@ import org.moire.ultrasonic.service.SubsonicRESTException
 fun SubsonicRESTException.getLocalizedErrorMessage(context: Context): String =
         when (error) {
             is Generic -> {
-                val message = (error as Generic).message
+                val message = error.message
                 val errorMessage = if (message == "") {
                     context.getString(R.string.api_subsonic_generic_no_message)
                 } else {