Root cause:
1. Android may not be installed only fetching might have done in eclipse.
2. Check the location of android installation in eclipse windows -> preferences -> android (installation path may not be correct).
Solution:
1. Give the correct android installed path in windows -> preferences -> android.
2. If you not able to find the path, better uninstall and install the android again.
Android download link for windows:
http://developer.android.com/sdk/index.html
Thanks for reading this post…………..!!!