rosrun cv_camera cv_camera_node causing fixed frame error

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I am running ros noetic on a raspberry pi 4. I am trying to use rosrun rviz rviz but when i do i get the following error For frame[camera]: Fixed Frame[map] does not exist.

I am using a logitech c920 webcam,

before trying to run rosrun rviz rviz i am running rosrun cv_camera cv_camera_node, i am using cv_camera because i could not get usb_cam to work due to deprecated ffmpeg code in usb_cam.....

within rviz under Global Status: Warn it says Fixed Frame No TF data

can anyone please help me fix this?