ORA-00481: LMON process terminated with error

Hi

I have a single instance development database located in node 2 of a 9i RAC database. (development purpose as well). Recently the non-rac database had an instance failure showing this error

error 481 detected in background process ORA-00481: LMON process terminated with error ksuitm: waiting for [5] seconds before killing DIAG

I understand that error should apply to a RAC database. I am not able to find out why the database failed. Any lights?

thanks

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