File to keep track of the used Error Codes and the relative exception. Some exceptions can be thrown from multiple places. The stacktrace usually points out to core developers why an exception was thrown in a specific instance, but users, often don't have knowledge of that and is much easier for them report the issue or search in a wiki with an error instead of a stacktrace.
Format: PEGA_XYZJ ExceptionName [, very high level description] No error code can be repeated, and no error code can be referenced more than once in code
PEGA_1000 to PEGA_1016 ServiceUnavailableException PEGA_1017 ServiceUnavailableException PEGA_1030 ServiceUnavailableException
PEGA_2001 RejectedExecutionException PEGA_2000 Not an exception, but a error log