Error in running nodes

[lizardX]

I build the package using catkin_make . Then sourced the devel/setup.bash file and ran roscore , so master is running.

When I run node using
rosrun stereo_dense_reconstruction stereo_rectify [/camera/left/topic] [/camera/right/topic] /home/lizardX/cvproject/cam_stereo.yml

I get

starting rectification
done rectification
terminate called after throwing an instance of 'ros::InvalidNameException' 
what():  Character [[] is not valid as the first character in Graph Resource Name [[/camera/left/topic]]. Valid characters are a-z, A-Z, / and in some cases ~.
Aborted

I am using two Logitech C270 USB cameras and Ubuntu 16.04 .

Any help would be appreciated. Thanks.