Perhaps the most common error for most people new to ATS will be [[typechecking errors|typechecking errors]]. For this reason, all new users are encouraged to read some demonstrations and examples in the [[typechecking errors|typechecking errors]] article.
Error messages are evolving in ATS2. There are five primary classes of error messages: [[parsing errors|parsing errors]], [[linker errors|linker errors]], [[runtime errors|runtime errors]], [[compiler errors|compiler errors]], and the most common -- [[typechecking errors|typechecking errors]]. For error messages known to have been used in the past, especially in ATS1, please see the old wiki.