Hello Satish,
It looks like you are trying on windows however the scripts used to install sdk and generate sample app are for Ubuntu Linux.Are you able to install sdk and generate sample app in Windows?
After SDK is installed successfully , required jars are installed in the local maven repository. Then you can generate the sample app using gen-sdn-app script.
Please try in Ubuntu Linux OS and let us know if you still face any issue.
Thanks,
HP SDN Team