Error in running Ping_Pong with python codelet

Hello,
I tried writing ping_pong tutorial in python. But I am getting errors as shown below, which is difficult to interpret.

WARNING: Cannot run target //apps/tutorials/ping_pong_python:ping_pong_python: Not executable. Will continue anyway
INFO: Elapsed time: 0.150s, Critical Path: 0.00s
INFO: 0 processes.
INFO: Build completed successfully, 1 total action
ERROR: Cannot run target //apps/tutorials/ping_pong_python:ping_pong_python: NotINFO: Build completed successfully, 1 total action

NOTE: Provided tutorials in python works well in my system. So, I am guessing there is no problem with installations,