# The compiler rejected my script. Now what?

> Read the message. It says what to change.

Source: https://algobarsx.com/docs/why-error/

Every message names the problem, the line and the column, and says what to do. Many carry a one-click fix. Search this page for the code, such as `AS0304`, or browse [Compiler Messages](https://algobarsx.com/docs/#diagnostics). The most common ones:

- [AS0201](https://algobarsx.com/docs/diag-names-and-types/#AS0201) a name the compiler does not know, usually a typo. It suggests the nearest name.
- [AS0302](https://algobarsx.com/docs/diag-units-and-risk/#AS0302) a number with no unit where a distance is expected.
- [AS0303](https://algobarsx.com/docs/diag-units-and-risk/#AS0303) and [AS0304](https://algobarsx.com/docs/diag-units-and-risk/#AS0304) an R target or a risk-based size with no stop to measure from.
- [AS0003](https://algobarsx.com/docs/diag-text-and-layout/#AS0003) a tab used for indentation. Use spaces.
- [AS0401](https://algobarsx.com/docs/diag-where-things-may-go/#AS0401) something in the wrong kind of script, such as an order in an indicator.