Gazebo does not load robo models

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I have been working with some robot simulations for some time but suddenly robot models stopped launching in gazebo stopped launching giving the error; [gazebo-2] process has died [pid 3466, exit code 255, cmd /home/evan/catkin_ws/src/gazebo_ros_pkgs/gazebo_ros/scripts/gzserver -e ode /home/evan/mybot_ws/src/mybot_gazebo/worlds/mybot.world __name:=gazebo __log:=/home/evan/.ros/log/e37cbab0-b913-11e8-94e5-441ca85eaa37/gazebo-2.log]. log file: /home/evan/.ros/log/e37cbab0-b913-11e8-94e5-441ca85eaa37/gazebo-2*.log I am using gazebo 7.14 version Please help