# Compiler messages: data

> AlgoBarsX compiler messages about data, with what each code means and the real message where there is one: AS0501, AS0502, AS0503.

Source: https://algobarsx.com/docs/diag-data/

###  AS0501 `brick_pattern`

###  AS0502 `unknown_symbol`

###  AS0503 `unknown_session` error

mars isn't a session. Sessions are sydney, tokyo, asia, london, frankfurt and new_york.