Message Oracle PLS-00203 - function DECODE must be called with at least 3 non-boolean arguments

ERRORfunction DECODE must be called with at least 3 non-boolean arguments
CAUSELess than three arguments were passed to the built-in function DECODE. Though DECODE takes a variable number of (non-Boolean) arguments, at least three arguments must be passed.
ACTIONCall DECODE with three or more arguments