CustomLog error... errorlogging is too large?

Hi, since today, my logging is being flooded by these kind of errors. As I read it, the stuff that is being pushed into the error log is too large? serious, WT... As I can see I don't have the "old" CustomLog. I do use AsyncLogging, not sure if that has something to do with it. but how can I fix this?
Module: CustomLog
Message: ORA-12899: value too large for column "HUBADMIN"."OSLOG_ERROR_7"."STACK"
(actual: 2003, maximum: 2000)