Program stuck when new a Controller()

when I run
`
from ai2thor.controller import Controller
controller = Controller()
`
the program got stuck and when I canceled it, it always stopped at:
`File "test.py", line 85, in main
controller = Controller()
File "/root/anaconda3/envs/savn/lib/python3.7/site-packages/ai2thor/controller.py", line 476, in __init__
host=host,
File "/root/anaconda3/envs/savn/lib/python3.7/site-packages/ai2thor/controller.py", line 1237, in start
self.last_event = self.server.receive()
File "/root/anaconda3/envs/savn/lib/python3.7/site-packages/ai2thor/fifo_server.py", line 179, in receive
metadata, files = self._recv_message()
File "/root/anaconda3/envs/savn/lib/python3.7/site-packages/ai2thor/fifo_server.py", line 103, in _recv_message
self.server_pipe = open(self.server_pipe_path, "rb")
KeyboardInterrupt
`
I tested on ai2thor3.3.4 and the latest 5.0, it all got the same problem, could anyone please help?