ORA-00981: cannot mix table and system auditing options
Cause: Table and system-wide auditing options were specified in the same AUDIT or NOAUDIT statement.
Action: You must issue table and system options in separate statements.
ORA-00983: cannot audit or noaudit SYS user actions
Cause: An attempt was made to AUDIT or NOAUDIT SYS user actions.
Action: Execute the statement again with a valid user.

ORA-00991: only MAC privileges may be granted to procedures
Cause: Object privileges or non-MAC system privileges were granted to the procedure.
Action: Only grant MAC privileges using the PROCEDURE clause.
ORA-01002: fetch out of sequence
Cause: This error means that a fetch has been attempted from a cursor which is no longer valid. Note that a PL/SQL cursor loop implicitly does fetches, and thus may also cause this error. There are a number of possible causes for this error, including: 1) Fetching from a cursor after the last row has been retrieved and the ORA-1403 error returned. 2) If the cursor has been opened with the FOR UPDATE clause, fetching after a COMMIT has been issued will return the error. 3) Rebinding any placeholders in the SQL statement, then issuing a fetch before reexecuting the statement.
Action: 1) Do not issue a fetch statement after the last row has been retrieved – there are no more rows to fetch. 2) Do not issue a COMMIT inside a fetch loop for a cursor that has been opened FOR UPDATE. 3) Reexecute the statement after rebinding, then attempt to fetch again.

ORA-01010: invalid OCI operation
Cause: One of the following: 1) You attempted an invalid OCI operation. 2) You are using an Oracle client application linked with version 7.1 (or higher) libraries, the environment variable ORA_ENCRYPT_LOGIN is set to TRUE, and you attempted to connect to a version 7.0 (or lower) Oracle Server. 3) You are connected to a version 7.1 (or higher) Oracle Server, the initialization parameter DBLINK_ENCRYPT_LOGIN is set to TRUE, and you attempted to use a database link pointing to a version 7.0 (or lower) Oracle Server. 4) You are connected to a version 9.0.2(or higher) Oracle Server and you attempted to use a database link pointing to a version 9.0.1(or lower) Oracle Server for distributed autonomous transaction.
Action: For the above causes: 1) Do not use the invalid OCI operation. 2) If you do not wish to use encrypted connect passwords in your distributed database, set ORA_ENCRYPT_LOGIN to FALSE. If you wish to use encrypted connect passwords, you must upgrade all Oracle Servers to version 7.1 (or higher). 3) If you do not wish to use encrypted database links in your distributed database, set DBLINK_ENCRYPT_LOGIN to FALSE. If you wish to use encrypted database links, you must upgrade all Oracle Servers to version 7.1 (or higher). 4) Do not attempt distributed autonomous transaction on version 9.0.1(or lower) Oracle Server.

Above are list of Oracle Database Errors or Warnings from Error ORA-00981 to ORA-01010 received while performing certain operation against Oracle Database or related products.

What are Oracle Database Error Messages?

Oracle Error Messages may be returned while using products which are part of Oracle Database.  Each Oracle Database Error or Warning Message mentioned above contains the Warning or Error Message Statement, a short explanation of the probable causes of the Error message, and a recommended action.

Hope this was helpful.

Thanks,
SQLServerF1 Team
Information about Oracle Database Error Messages or Warning Messages on Windows and Linux Operating Systems.