Address the circus/tornado "ConflictError: arbiter is already running"

[hpelin]

I can't remember if we were getting this before, but after I hit train, the model trains and is saved successfully but after I get this error:
Traceback (most recent call last): File "/Users/christina.bukas/opt/anaconda3/envs/dc-tool/lib/python3.9/site-packages/tornado/ioloop.py", line 921, in _run val = self.callback() File "/Users/christina.bukas/opt/anaconda3/envs/dc-tool/lib/python3.9/site-packages/circus/util.py", line 1038, in wrapper raise ConflictError("arbiter is already running %s command" circus.exc.ConflictError: arbiter is already running arbiter_stop command Traceback (most recent call last): File "/Users/christina.bukas/Documents/AI_projects/code/data-centric-platform/src/server/dcp_server/main.py", line 31, in <module> main() File "/Users/christina.bukas/Documents/AI_projects/code/data-centric-platform/src/server/dcp_server/main.py", line 18, in main subprocess.run([ File "/Users/christina.bukas/opt/anaconda3/envs/dc-tool/lib/python3.9/subprocess.py", line 507, in run stdout, stderr = process.communicate(input, timeout=timeout) File "/Users/christina.bukas/opt/anaconda3/envs/dc-tool/lib/python3.9/subprocess.py", line 1126, in communicate self.wait() File "/Users/christina.bukas/opt/anaconda3/envs/dc-tool/lib/python3.9/subprocess.py", line 1189, in wait return self._wait(timeout=timeout) File "/Users/christina.bukas/opt/anaconda3/envs/dc-tool/lib/python3.9/subprocess.py", line 1917, in _wait (pid, sts) = self._try_wait(0) File "/Users/christina.bukas/opt/anaconda3/envs/dc-tool/lib/python3.9/subprocess.py", line 1875, in _try_wait (pid, sts) = os.waitpid(self.pid, wait_flags)

Originally posted by @christinab12 in #27 (comment)