Error in installing ROS

[akshata1100]

These are the errors I'm getting-
E: Malformed entry 1 in list file /etc/apt/sources.list.d/ros-latest.list (Suite)
E: The list of sources could not be read.

Thank you

[arjun2010870]

hey i am getting the error: bash: " /opt/ros/melodic/setup.bash: No such file or directory "
when i enter the command: " source ~/.bashrc "

what may be the cause and how can i solve it ?