If you receive this error message, it means World of Warcraft lost its connection to the server.
Information on the World server is down error.
Troubleshooting for problems installing or patching the World of Warcraft game client
Eligibility and limitations to consider when a free character transfer is available
Troubleshooting steps for error message Could Not Connect to the Network Data Source.
What to do if you cannot play WoW Classic even if you have game time or subscription
Troubleshooting steps to resolve error message in World of Warcraft.
Information on this error when looting fish or fishing items