ORA-21560: argument string is null, invalid

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ORA-21560: argument string isnull, invalid, or out of range
Cause: The argument is expecting a non-null, valid value butthe argument value
passed in is null, invalid, or out of range. Examples include when the LOB/FILE
ORA-19999 to ORA-24279 15-3
positional or size argument has a value outside therange 1 through (4GB - 1), or
when an invalid open mode is used to open a file, etc.
Action: Checkyour program and correct the caller of the routine to not pass a
null, invalid or out-of-range argument value.