An error is a piece information displayed when an unexpected event occurs. On modern Roblox versions, error messages are often displayed using a red rectangle at the top. Error messages are used when user intervention is required, to indicate that a desired operation has failed, or to relay important warnings (such as warning a computer user that they are almost out of hard disk space). Error messages are seen widely throughout Roblox, and are part of every Roblox version.
Common error messages
Happens when downloading of the client times out. This usually occurs with poor internet speed/connection.
Happens when the client was unable to join the server. Commonly occurs when roblox.com is blocked by the local internet or by a government (very rare), this commonly occurs too after the players get disconnected and the players need to wait a bit or jon another game.
Happens when the client was unable to connect to the internet.
Happens when the client attempts to join a place different from the start place in a game.