I can't see the ball in the find object?

Unit 5: Perception and Object Recognition

When I run
roslaunch my_object_recognition_pkg start_find_object_2d.launch

find object Run

But I can’t see the ball??
I can’t see even if I move the camera.
Code: live class 59 >> upload

#picture(My test)

Hello @mdc1020,

I’ve just tested this and I can see the ball properly:

Did you follow the instructions in the notebook?

I’m sorry…
Work process until the ball appears in “Find Object”
I would like a video (mp4).
P.S: I can’t see the ball again today

I cannot see the ball in Rviz after roslaunch as well. So, please fix this bug.