Usage issue, Level.dat not found"

[Henton03]

Hi, 99% sure this will be a user issue (as in I haven't set it up right) however looking for help with setup of a server:

Using docker compose via portainer

Currently getting the error : Error ServerMultiplayerManager.cpp:92: MultiplayerManager failed: "level.dat not found."
This only appears to occur when I have data in the Save folder , just cleared this and re-deployed the image and it loads fine and starts etc, but once I change to : -GENERATE_NEW_SAVE=FALSE and -LOAD_LATEST_SAVE=TRUE then I get the above

current stack / yaml file is :
version: '3' services: factorio: image: factoriotools/factorio:stable container_name: factorio_server environment: - GENERATE_NEW_SAVE=TRUE - LOAD_LATEST_SAVE=FALSE # Set to true if you want to load the latest save ports: - "34197:34197/udp" # Game server (required) - "27015:27015/tcp" # RCON (optional) volumes: - /factorio:/factorio # Mount a volume for game data #restart: unless-stopped

Any help will be great