No python executable could be found on your system , Titanium

No python executable could be found on your system , Titanium

I am using eclipse to make titanium module, but whenever I use Ant build i
get error
No python executable could be found on your system
i have installed
Titanium SDK. All of the prerequisites for developing Android
applications. Android NDK. Add an ANDROID_NDK environment variable
pointing to the NDK folder. Eclipse and ADT. gperf e installed and in your
system PATH.
I also checked my bulid.properties which is like this:
titanium.platform=C:\\Users\\Titanium\\mobilesdk\\win32\\3.1.1.GA\\android
android.platform=C:\\AndroidSDK\\platforms\\android-10
google.apis=C:\\AndroidSDK\\add-ons\\addon-google_apis-google-10
android.ndk = C:\\android-ndk-r9
What is wrong with mine?