Why do i get message no such file or directory when i am trying to set my environments on hydro?

I am trying to set the environment setup after installing the ROS full package using terminal. I get the following message: kadir@kadir:~$ echo "source /opt/ros/hydro/setup.bash" >> ~/.bashrc kadir@kadir:~$ source ~/.bashrc bash: /opt/ros/cturtle/setup.bash: No such file or directory what am i doing wrong? P.S beginner