Run the demo but the exploration stoped

[WenyuLWY]

It happens when I run the default launch sim_env.launch, robot_move.launch and explorer.launch.

The robot is stuck, and the terminal outputs:

[INFO] [1759907222.883742860, 3671.294000000]: the path get.
[INFO] [1759907222.883821863, 3671.294000000]: following the path...
[WARN] [1759907222.883900067, 3671.294000000]: this iteration planning 9276 is run too time to reach the goal
[INFO] [1759907222.883966570, 3671.294000000]: Planning iteration 9277
[INFO] [1759907222.883984571, 3671.294000000]: call for the path to explore..
[INFO] [1759907222.898271640, 3671.308000000]: the path get.
[INFO] [1759907222.898487850, 3671.309000000]: following the path...
[WARN] [1759907222.898568453, 3671.309000000]: this iteration planning 9277 is run too time to reach the goal
[INFO] [1759907222.898605455, 3671.309000000]: Planning iteration 9278
[INFO] [1759907222.898640457, 3671.309000000]: call for the path to explore..
[WARN] [1759907222.898766263, 3671.308000000]: get a path, executing ....
[INFO] [1759907222.911072139, 3671.321000000]: the path get.
[INFO] [1759907222.911164043, 3671.321000000]: following the path...
[WARN] [1759907222.911246747, 3671.321000000]: this iteration planning 9278 is run too time to reach the goal
[INFO] [1759907222.911289649, 3671.322000000]: Planning iteration 9279
[INFO] [1759907222.911307650, 3671.322000000]: call for the path to explore..

What should I do to run the full demo successfully?