Answer / guest

Cause: A role specified by a proxy user as an initial role
to be activated upon connecting on behalf of a client is
invalid.

Action: Connect again as the client specifying a valid role.

Please add more information about this Error

ORA-06437: ssaio: the asynchronous write was unable to write to the database file.

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ORA-25208: RELATIVE_MSGID must be specified if SEQUENCE_DEVIATION is BEFORE

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RMAN-20205: incomplete UNTIL clause

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ORA-31624: operation string not allowed when job in string state

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ORA-38497: Expression Filter index does not exist

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ORA-07582: spstp: ORA_SID has illegal value

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TNS-12618: TNS:versions are incompatible

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