All Oracle Error CodesOracle DBA Forum

ORA-00255:

error archiving log string of thread string, sequence # string
Cause: An error occurred during archiving.
Action: Check the accompanying message stack for more detailed information. If the online log is corrupted, then the log can be cleared using the UNARCHIVED option. This will make any existing backups useless for recovery to any time after the log was created, but will allow the database to generate redo.