pentaho/pentaho-kettle · error

The function call LuhnCheck requires 1 argument.

Error message

The function call LuhnCheck requires 1 argument.

What it means

LuhnCheck validates a number string using the Luhn algorithm and requires exactly one argument. When called with zero or multiple arguments it throws a Rhino RuntimeError: 'The function call LuhnCheck requires 1 argument.'

Solutions

1. Pass exactly one argument (the numeric string) to LuhnCheck.
2. Ensure the variable is defined before the call so you're not passing nothing/extra values.
3. If validating multiple values, call the function once per value in a loop.

Example fix

// before
var ok = LuhnCheck(cardNumber, true);
// after
var ok = LuhnCheck(cardNumber);

// JS guard before calling
if (cardNumber === undefined || cardNumber === null) return false;
var ok = LuhnCheck(String(cardNumber));

function safeLuhnCheck(v) {
  if (v === null || v === undefined) return false;
  return LuhnCheck(String(v));
}

try { var ok = LuhnCheck(num); }
catch (e) { if (String(e).indexOf('requires 1 argument') >= 0) { /* fix arity */ } throw e; }

When it happens

Trigger: Calling LuhnCheck() with an argument count other than 1 from JavaScript in a Script step, e.g. LuhnCheck(card) where card is undefined still counts as 1 arg, but LuhnCheck() or LuhnCheck(a, b) fails.

Common situations: Credit card validation scripts passing extra format options; forgetting to pass the variable; copying a call signature from a different utility.

Understand the failure class

Background: "missing required argument" and "the following required arguments were not provided": what required-argument errors mean and how to fix them — this error's family across 20 libraries.

Related errors

• The function call getDigitsOnly requires 1 argument.
• The function call indexOf requires 2 or 3 arguments
• The function call copyFileis not valid.
• The function call getFileSize is not valid.
• The function call isEmpty is not valid

AI-assisted analysis of pentaho/pentaho-kettle@f3058517a1 (2026-09-13). Data as JSON: /api/errors/15b91cd2901344a6. Report an issue: GitHub.

Appendix: source

Thrown at engine/src/main/java/org/pentaho/di/trans/steps/scriptvalues_mod/ScriptValuesAddedFunctions.java:172

            } else {
              addend = digit;
            }
            sum += addend;
            timesTwo = !timesTwo;
          }

          int modulus = sum % 10;
          if ( modulus == 0 ) {
            returnCode = true;
          }
        } catch ( Exception e ) {
          // No Need to throw exception
          // This means that input can not be parsed to Integer
        }

      }
    } else {
      throw Context.reportRuntimeError( "The function call LuhnCheck requires 1 argument." );

    }
    return returnCode;
  }

  public static int indexOf( Context actualContext, Scriptable actualObject, Object[] ArgList,
    Function FunctionContext ) {

    int returnIndex = -1;

    if ( ArgList.length == 2 || ArgList.length == 3 ) {
      if ( !isNull( ArgList ) && !isUndefined( ArgList ) ) {
        String string = Context.toString( ArgList[0] );
        String subString = Context.toString( ArgList[1] );

        int fromIndex = 0;
        if ( ArgList.length == 3 ) {
          fromIndex = (int) Math.round( Context.toNumber( ArgList[2] ) );

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