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ORA-08445:

syntax error in SIGN clause in mask options
Cause: A syntax error was found in the SIGN clause in the mask options parameter passed to a UTL_PG conversion routine. Valid specifications are: SIGN LEADING SIGN LEADING SEPARATE SIGN LEADING SEPARATE CHARACTER SIGN TRAILING SIGN TRAILING SEPARATE SIGN TRAILING SEPARATE CHARACTER SIGN IS LEADING SIGN IS LEADING SEPARATE SIGN IS LEADING SEPARATE CHARACTER SIGN IS TRAILING SIGN IS TRAILING SEPARATE SIGN IS TRAILING SEPARATE CHARACTER
Action: Correct the mask options parameter.