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"roscore" is not initializing - ROS MELODIC

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I have installed ROS_MELODIC in my Ubuntu 18.04.1 LTS machine. When I started the ros master with *roscore*, I got an exception as quoted. > `... logging to /home/revan/.ros/log/199d6f5c-b3e9-11e8-b3b6-54a0507ac74b/roslaunch-revaapriyan-6988.log Checking log directory for disk usage. This may take awhile. Press Ctrl-C to interrupt Done checking log file disk usage. Usage is <1GB. RLException: Invalid tag: Cannot load command parameter [rosversion]: no such command [rosversion roslaunch]. Param xml is The traceback for the exception was written to the log file` The Traceback in the log file: > [roslaunch][ERROR] 2018-09-09 10:00:37,367: RLException: Invalid tag: Cannot load command parameter [rosversion]: no such command [rosversion roslaunch]. Param xml is [roslaunch][ERROR] 2018-09-09 10:00:37,367: The traceback for the exception was written to the log file [roslaunch][ERROR] 2018-09-09 10:00:37,368: Traceback (most recent call last): File "/opt/ros/melodic/lib/python2.7/dist-packages/roslaunch/__init__.py", line 322, in main p.start() File "/opt/ros/melodic/lib/python2.7/dist-packages/roslaunch/parent.py", line 277, in start self._start_infrastructure() File "/opt/ros/melodic/lib/python2.7/dist-packages/roslaunch/parent.py", line 226, in _start_infrastructure self._load_config() File "/opt/ros/melodic/lib/python2.7/dist-packages/roslaunch/parent.py", line 138, in _load_config roslaunch_strs=self.roslaunch_strs, verbose=self.verbose) File "/opt/ros/melodic/lib/python2.7/dist-packages/roslaunch/config.py", line 447, in load_config_default load_roscore(loader, config, verbose=verbose) File "/opt/ros/melodic/lib/python2.7/dist-packages/roslaunch/config.py", line 94, in load_roscore loader.load(f_roscore, config, core=True, verbose=verbose) File "/opt/ros/melodic/lib/python2.7/dist-packages/roslaunch/xmlloader.py", line 751, in load self._load_launch(launch, ros_config, is_core=core, filename=filename, argv=argv, verbose=verbose) File "/opt/ros/melodic/lib/python2.7/dist-packages/roslaunch/xmlloader.py", line 723, in _load_launch self._recurse_load(ros_config, launch.childNodes, self.root_context, None, is_core, verbose) File "/opt/ros/melodic/lib/python2.7/dist-packages/roslaunch/xmlloader.py", line 657, in _recurse_load default_machine, is_core, verbose) File "/opt/ros/melodic/lib/python2.7/dist-packages/roslaunch/xmlloader.py", line 667, in _recurse_load self._param_tag(tag, context, ros_config, verbose=verbose) File "/opt/ros/melodic/lib/python2.7/dist-packages/roslaunch/xmlloader.py", line 95, in call return f(*args, **kwds) File "/opt/ros/melodic/lib/python2.7/dist-packages/roslaunch/xmlloader.py", line 282, in _param_tag "Invalid tag: %s. \n\nParam xml is %s"%(e, tag.toxml())) XmlParseException: Invalid tag: Cannot load command parameter [rosversion]: no such command [rosversion roslaunch]. Param xml is My env variables are set as: ROS_ETC_DIR=/opt/ros/melodic/etc/ros ROS_ROOT=/opt/ros/melodic/share/ros ROS_MASTER_URI=http://localhost:11311 ROS_VERSION=1 ROS_PYTHON_VERSION=2 ROS_PACKAGE_PATH=/opt/ros/melodic/share ROSLISP_PACKAGE_DIRECTORIES= ROS_HOSTNAME=localhost ROS_DISTRO=melodic PS: gcc version - 7.3.0

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