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
ID 6
Happens when downloading of the client times out. This usually occurs with poor internet speed/connection.
ID 17
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).
ID 142
Happens when the client was unable to connect to the internet.
ID 146
Happens when the client attempts to join a place different from the start place in a game.
In-game error
An in-game error (not given by the client) is an error appearing in an individual game. An example is when a gamepass or developer product fails to complete the transaction with Robux.