Exception error while running flatland-evaluator

Error : env_client.step called before env_client.env_create() call Traceback (most recent call last): File "/home/[user]/anaconda3/lib/python3.7/site-packages/flatland/evaluators/service.py", line 873, in run self.handle_env_step(command) File "/home/[user]/anaconda3/lib/python3.7/site-packages/flatland/evaluators/service.py", line 588, in handle_env_step "env_client.step called before env_client.env_create() call") Exception: env_client.step called before env_client.env_create() call

What's interesting is I haven't modified service.py in any manner.