UnboundLocalError: local variable 'client' referenced before assignment

[hassoun123]

pygame 2.1.2 (SDL 2.0.18, Python 3.7.9)
Hello from the pygame community. https://www.pygame.org/contribute.html
Failed to make a connection with the server: map not found

Client version: e32e6bff
Server version: e32e6bff

There is a Client and Server version mismatch! Please install or download the right versions.
ERROR:root:Connection has been refused by the server.

Exit
Traceback (most recent call last):
File "continuous_driver.py", line 297, in
runner()
File "continuous_driver.py", line 115, in runner
env = CarlaEnvironment(client, world,town, checkpoint_frequency=None)
UnboundLocalError: local variable 'client' referenced before assignment

although both client and server are the same version, it still gives me a mismatch error and doesn't run