Simulation using Gazebo

[mybot_world.launch] is neither a launch file in package [mybot_gazebo] nor is [mybot_gazebo] a launch file name
The traceback for the exception was written to the log file

Help me in resolving this error

you need to either start a new shell, or issue:

source ~/mybot_ws/ devel/setup.bash

before using roslaunch.

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