title: com.android.builder.testing.api.DeviceException: No connected devices
body: <pre><code>Scanning folders for symlinks in /home/sino/Desktop/we-clone/node_modules (4ms)
  Starting JS server...
  Building and installing the app on the device (cd android &amp;&amp; ./gradlew installDebug)...
  Incremental java compilation is an incubating feature.
  :app:preBuild UP-TO-DATE
  :app:preDebugBuild UP-TO-DATE
  :app:checkDebugManifest
  :app:preReleaseBuild UP-TO-DATE
  :app:prepareComAndroidSupportAppcompatV72301Library UP-TO-DATE
  :app:prepareComAndroidSupportSupportV42301Library UP-TO-DATE
  :app:prepareComFacebookFbuiTextlayoutbuilderTextlayoutbuilder100Library UP-TO-DATE
  :app:prepareComFacebookFrescoDrawee130Library UP-TO-DATE
  :app:prepareComFacebookFrescoFbcore130Library UP-TO-DATE
  :app:prepareComFacebookFrescoFresco130Library UP-TO-DATE
  :app:prepareComFacebookFrescoImagepipeline130Library UP-TO-DATE
  :app:prepareComFacebookFrescoImagepipelineBase130Library UP-TO-DATE
  :app:prepareComFacebookFrescoImagepipelineOkhttp3130Library UP-TO-DATE
  :app:prepareComFacebookReactReactNative0493Library UP-TO-DATE
  :app:prepareComFacebookSoloaderSoloader010Library UP-TO-DATE
  :app:prepareOrgWebkitAndroidJscR174650Library UP-TO-DATE
  :app:prepareDebugDependencies
  :app:compileDebugAidl UP-TO-DATE
  :app:compileDebugRenderscript UP-TO-DATE
  :app:generateDebugBuildConfig UP-TO-DATE
  :app:mergeDebugShaders UP-TO-DATE
  :app:compileDebugShaders UP-TO-DATE
  :app:generateDebugAssets UP-TO-DATE
  :app:mergeDebugAssets UP-TO-DATE
  :app:generateDebugResValues UP-TO-DATE
  :app:generateDebugResources UP-TO-DATE
  :app:mergeDebugResources UP-TO-DATE
  :app:bundleDebugJsAndAssets SKIPPED
  :app:processDebugManifest UP-TO-DATE
  :app:processDebugResources UP-TO-DATE
  :app:generateDebugSources UP-TO-DATE
  :app:incrementalDebugJavaCompilationSafeguard UP-TO-DATE
  :app:compileDebugJavaWithJavac UP-TO-DATE
  :app:compileDebugNdk UP-TO-DATE
  :app:compileDebugSources UP-TO-DATE
  :app:transformClassesWithDexForDebug UP-TO-DATE
  :app:mergeDebugJniLibFolders UP-TO-DATE
  :app:transformNative_libsWithMergeJniLibsForDebug UP-TO-DATE
  :app:processDebugJavaRes UP-TO-DATE
  :app:transformResourcesWithMergeJavaResForDebug UP-TO-DATE
  :app:validateSigningDebug
  :app:packageDebug UP-TO-DATE
  :app:assembleDebug UP-TO-DATE
  :app:installDebug
  07:52:34 E/adb: * daemon not running; starting now at tcp:5037
  07:52:37 E/adb: * daemon started successfully
  :app:installDebug FAILED
  
  FAILURE: Build failed with an exception.
  
  * What went wrong:
  Execution failed for task ':app:installDebug'.
  &gt; com.android.builder.testing.api.DeviceException: No connected devices!
  
  * Try:
  Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.
  
  BUILD FAILED
  
  Total time: 8.916 secs
  Could not install the app on the device, read the error above for details.
  Make sure you have an Android emulator running or a device connected and have
  set up your Android development environment:
  https://facebook.github.io/react-native/docs/android-setup.html
  </code></pre>