Unable to read local eventlog (reason: The data area passed to a system call is too small).
This event log entry usually appears right after an application error (e.g. "Application Error", Event ID 1000) occurs and is logged by the SQL Server Agent.
You can safely ignore this error, it is a result of the SQL Agent monitoring the Application event log with a buffer that is too small.
The source might vary, for example it might also be logged as SQLAgent$SOPHOS or similar.