Answer / guest

Cause: An attempt was made to acess the attributes of a NULL
object instance.

Action: Ensure that the object instance is non-NULL before
accessing.

Please add more information about this Error

ORA-19756: corrupt block number string found in change tracking file

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NZE-29015: incorrect message length

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ORA-02211: invalid value for PCTFREE or PCTUSED

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SQL*Loader-00552: insufficient privilege to open file

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