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ORA-01862:

the numeric value does not match the length of the format item
Cause: When the FX and FM format codes are specified for an input date, then the number of digits must be exactly the number specified by the format code. For example, 9 will not match the format specifier DD but 09 will.
Action: Correct the input date or turn off the FX or FM format specifier in the format string.