Unit5 Rviz error

Hello!
In unit 5 of path planning, after launching unit5_exercise file i am getting this error(attahed image)
In Rviz neither robot is launched nor i could see effect of repulsive and attractive filed.Thanks

Hello @misbahsuhail123,

this error appears if you input a goal pose in Rviz before the “Ready to accept commands” message is displayed.

To avoid this error please wait until the “Ready to accept commands” message is displyed in Rviz.

Could you please provide the exercise number you are at the moment? I would like to fix the instructions to include this information.

Cheers,

Roberto