Error : Unable to resolve project target 'android-19' while previewing on android device

Hey guys i am posting this error which i get everytime i preview the example app on android.Everything works fine when i am previewing locally.I am posting the build report below. Please try to help me ASAP.

Building project ‘MyFirstProject’, target ‘Android’

BUILD FAILED C:\Users\Gaurav\AppData\Local\Android\sdk\tools\ant\build.xml:538: Unable to resolve project target ‘android-19’

Total time: 4 seconds (exit code: 1)

: EUNKNOWN: Native target failed to build

Build completed in 363.67 seconds 0 Warning(s) 1 Error(s)

Error Summary

: EUNKNOWN: Native target failed to build

Build complete.

Hey, looks like Android platform-19 tools is missing. It should have been installed if you did fuse install android. You may also install it directly from Android SDK Manager.