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what does rviz means?

Yesterday, I could navigate my turtlebot with eband_local_planner. but today, I can't move it. So, rviz says following warning.

[ WARN] [1401378967.283247030]: MessageFilter [target=map ]: Discarding message from [/move_base] due to empty frame_id.  This message will only print once.
[ WARN] [1401378967.283417501]: Invalid argument passed to canTransform argument source_frame in tf2 frame_ids cannot be empty
[ WARN] [1401378998.796621804]: Invalid argument passed to canTransform argument source_frame in tf2 frame_ids cannot be empty
[ WARN] [1401379032.819038628]: Invalid argument passed to canTransform argument source_frame in tf2 frame_ids cannot be empty

Does anyone have any idea to solve these warning?

After that, Eband_local_planner says that it can't make path as following

[ INFO] [1401378966.134403366]: Global plan set to elastic band for optimization
[ERROR] [1401378967.110080798]: NO PATH!
[ERROR] [1401378967.110401250]: Failed to get a plan from potential when a legal potential was found. This shouldn't happen.
[ERROR] [1401378998.546064278]: NO PATH!
[ERROR] [1401378998.614580138]: Failed to get a plan from potential when a legal potential was found. This shouldn't happen.
[ WARN] [1401378998.734102440]: Clearing costmap to unstuck robot.

what does rviz means?mean?

Yesterday, I could navigate my turtlebot with eband_local_planner. but today, I can't move it. So, rviz says following warning.

[ WARN] [1401378967.283247030]: MessageFilter [target=map ]: Discarding message from [/move_base] due to empty frame_id.  This message will only print once.
[ WARN] [1401378967.283417501]: Invalid argument passed to canTransform argument source_frame in tf2 frame_ids cannot be empty
[ WARN] [1401378998.796621804]: Invalid argument passed to canTransform argument source_frame in tf2 frame_ids cannot be empty
[ WARN] [1401379032.819038628]: Invalid argument passed to canTransform argument source_frame in tf2 frame_ids cannot be empty

Does anyone have any idea to solve these warning?

After that, Eband_local_planner says that it can't make path as following

[ INFO] [1401378966.134403366]: Global plan set to elastic band for optimization
[ERROR] [1401378967.110080798]: NO PATH!
[ERROR] [1401378967.110401250]: Failed to get a plan from potential when a legal potential was found. This shouldn't happen.
[ERROR] [1401378998.546064278]: NO PATH!
[ERROR] [1401378998.614580138]: Failed to get a plan from potential when a legal potential was found. This shouldn't happen.
[ WARN] [1401378998.734102440]: Clearing costmap to unstuck robot.

what does rviz mean?error: "Discarding message from [/move_base] due to empty frame_id"

Yesterday, I could navigate my turtlebot with eband_local_planner. but today, I can't move it. So, rviz says following warning.

[ WARN] [1401378967.283247030]: MessageFilter [target=map ]: Discarding message from [/move_base] due to empty frame_id.  This message will only print once.
[ WARN] [1401378967.283417501]: Invalid argument passed to canTransform argument source_frame in tf2 frame_ids cannot be empty
[ WARN] [1401378998.796621804]: Invalid argument passed to canTransform argument source_frame in tf2 frame_ids cannot be empty
[ WARN] [1401379032.819038628]: Invalid argument passed to canTransform argument source_frame in tf2 frame_ids cannot be empty

Does anyone have any idea to solve these warning?

After that, Eband_local_planner says that it can't make path as following

[ INFO] [1401378966.134403366]: Global plan set to elastic band for optimization
[ERROR] [1401378967.110080798]: NO PATH!
[ERROR] [1401378967.110401250]: Failed to get a plan from potential when a legal potential was found. This shouldn't happen.
[ERROR] [1401378998.546064278]: NO PATH!
[ERROR] [1401378998.614580138]: Failed to get a plan from potential when a legal potential was found. This shouldn't happen.
[ WARN] [1401378998.734102440]: Clearing costmap to unstuck robot.