pr2_gazebo pr2.launch outputs pr2_gripper_action error [closed]

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Hi! I was following the pr2_simulator tutorials and when trying the commands:

roslaunch gazebo_worlds gazebo_empty_world.launch

roslaunch pr2_gazebo pr2.launch

I get in the output the error:

ERROR: cannot launch node of type [pr2_gripper_action/pr2_gripper_action]: Cannot locate node of type [pr2_gripper_action] in package [pr2_gripper_action]

Altough the pr2 model actually spawns. Does anyone know why this happens?

Thanks!