URDF Error during Intera MoveIt Tutorial

[Julian S 0]

I am trying to control the Sawyer robot with the help of the Intera MoveIt tutorial.

https://sdk.rethinkrobotics.com/intera/MoveIt_Tutorial
The problem is with the following command:

roslaunch sawyer_moveit_config sawyer_moveit.launch electric_gripper:=true

The first time I ran it everything went fine, I was able to plan and execute movements in rviz. But when I ran the command again today the following error came up and nothing works anymore.

[ERROR] [1638439994.358624936]: Link 'right_gripper_tip' declared as part of a chain in group 'right_arm' is not known to the URDF