Malformed line 1 in source list error

Question

i wanted to install the husky robot to use it in gazebo

sudo apt-get install ros-kinetic-husky-simulator

but i got this error

E: Malformed line 1 in source list /etc/apt/sources.list.d/gazebo-stable.list (type) E: The list of sources could not be read. E: Malformed line 1 in source list /etc/apt/sources.list.d/gazebo-stable.list (type) E: The list of sources could not be read.