Does not compile after added unity ads plugins

I am getting this error when i try to compile. Before added unity ads every thing was working fine.

Error building Player: Win32Exception: ApplicationName='javac.exe', CommandLine='-bootclasspath "C:/android-sdk-windows/platforms/android-21\android.jar" -d "C:\Documents\newproject\Temp\StagingArea\bin\classes" -source 1.6 -target 1.6 -encoding ascii "com\space\ksoft\R.java" "com\unity3d\ads\android\R.java"', CurrentDirectory='C:\Documents\newproject\Temp\StagingArea\gen'

 

Hello Emre,
Its somethink about your android sdk or java version. Try to update your android sdk files from SDK Manager. Or check your java compiler.

Regards

 

Your system path variable is missing a reference to your Java Development Kit. If you haven't already, download and install the latest JDK. Then be sure to set a reference to it in your system path.

Check out this post for further instructions.