Mattermost-push-proxy.json: no such file or directory

After building a mattermost server, db, a push server is being created.

The following error occurs while creating a push server using docker.
mattermost-push-proxy.json: no such file or directory

The current development environment is as follows.
Path that ran docker run
→ /mattermost/PUSH

docker run command
→ docker run --name=push-proxy -d --publish=8080:80 -v /mattermost/PUSH/config:/mattermost-push-proxy.json mattermost/mattermost-push-proxy

The /mattermost/PUSH/config path contains the mattermost-push-proxy.json file.
-rwxrwxrwx 1 root root 1070 Jan 23 07:31 mattermost-push-proxy.json

However, if you check the docker logs after running, it will be called mattermost-push-proxy.json: no such file or directory
Only the error message is repeated.

I ask for advice.