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Your xacro file (smartcar.urdf.xacro) is invalid; just run the command that's mentioned above from the command line and look at the error messages in the output:
rosrun xacro xacro.py /home/viki/ros_workspace/smartcar_description/urdf/smartcar.urdf.xacro
Once you've fixed your xacro file, everything should be fine.
If you can't find the bug, please update your question with a link to your xacro file (use the "edit" button).