Unable to transform from frame '' to frame '/base_link'. Returning entity

[ChenLong-Cristian]

Dear Authors:
when I run the command
"rosrun rosbook_arm_snippets move_group_add_object"
and there is a problem:
Unable to transform from frame '' to frame '/base_link'. Returning entity
can you help me.
thank you

[ChenLong-Cristian]

then when I run"roslaunch rosbook_arm_pick_and_place grasp_generator_server.launch "
there is also a problem: "Grasp configuration parameter pregrasp_time_from_start missing from rosparam server. Did you load your end effector's configuration yaml file? "

version: ros-kinetic

[efernandez]

Thanks for your feedback @ChenLong-Cristian and sorry for the late reply.
Will try to reproduce your first problem. For the second it actually seems the configuration yaml file is missed and should be loaded.