How do I get the keyfile “server.crt"?

[pingfree]

LAUNCH.sh:
gunicorn -w 4 -b 0.0.0.0:1443 server:app --access-logfile - --error-logfile - --keyfile ../../CA/server.key --certfile ../../CA/server.crt --ca-certs ../../CA/chain.pem
run ./LAUNCH.sh
alert me :
create_sockets
raise ValueError('certfile "%s" does not exist' % conf.certfile)
ValueError: certfile "../../CA/server.crt" does not exist