This error usually occurs when the system cannot find the android.bat under your NVPACK\android-sdk-windows\tools.
I am assuming you have the Environment Variables correctly set under
Control Panel → System and Security → System → Advanced System Settings under Advanced Tab → Environment Variables. (This is usually automatically done by CodeWorks/NVPACK Installation)
and also the paths in project settings set correctly under Edit → Project Settings → platforms → Android SDK.
Also, check this thread for the solution to a problem similar to yours
uninstall all codeworks for android delete nvpack folderd download from nvidia their site (need account ) istall got to project settings do the folder thing set ndk to android-19 and sdk to latest and you are ready