1.6 fixed frame deepmind_robot1_odom is not in the options

As seen in the picture the option deepmind_robot1_odom is not an option for the fixed frame. Also I saw that I have a huge amount less options to choose from. Is there somthing what I can do with this?

Could you please provide more context for this issue?

  • Which specific exercise or example are you trying to follow?
  • Have you completed all previous exercises? Skipping some exercises can cause this.
  • Have you followed each step of this exercise carefully?

It is exercise 1.6.1.
I completed all previus exercises and I followed eacht step carefully.