ngCordova file plugin error

Hi all,
Thanks for the help in advance
Iam getting the following error

Note: Some input files use or override a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
Note: D:\wamp\www\Ionic\ta-testBuild\platforms\android\src\org\apache\cordova\file\AssetFilesystem.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.

this is very strange and when i add in crossover the built apk cannot be installed as well.