Promtail error: no files matched requested path, nothing will be tailed

This is using the default configuration, I am running this via Docker on OSS. (Container version 2.5)
Promtail config:

server:
  http_listen_port: 9080
  grpc_listen_port: 0

positions:
  filename: /tmp/positions.yaml

clients:
  - url: http://loki:3100/loki/api/v1/push

scrape_configs:
- job_name: system
  static_configs:
  - targets:
      - localhost
    labels:
      job: varlogs
      __path__: "/var/log/*log"