Task error?

[LemonQC]

I run task builder and run any task py
Traceback (most recent call last):
File "task_builder.py", line 134, in new_variation
descriptions = self.scene.init_episode(
File "/home/lemon/RLBench-master/tools/../rlbench/backend/scene.py", line 136, in init_episode
self.task.validate()
File "/home/lemon/RLBench-master/tools/../rlbench/backend/task.py", line 274, in validate
self._waypoints = self._get_waypoints()
File "/home/lemon/RLBench-master/tools/../rlbench/backend/task.py", line 415, in _get_waypoints
feasible, way_i = self._feasible(waypoints)
File "/home/lemon/RLBench-master/tools/../rlbench/backend/task.py", line 366, in _feasible
path.set_to_end()
AttributeError: 'tuple' object has no attribute 'set_to_end'