I was having the same issue. This is what I did to fix it.
1. Created minio share /mnt/user/minio
2. Started minio and let it create /.minio.sys/config
3. Stopped minio
4. Created config.json in config folder
5. Pasted this config file into it: https://raw.githubusercontent.com/cheesemarathon/docker-templates/master/cheesemarathon/minio.xml
6. Started again
Works for me now. Hope this helps someone else.