Cannot mul incompatible operands of type List of Variant and type List of Variant.

Hello Folks,

Please anyone guide me on this?

I am using below code and getting this error: "Cannot mul incompatible operands of type List of Variant and type List of Variant."  Basically I am multiplying two values. Any thoughts on this?

 a!textField(
                    label: "",
                    labelPosition: "ADJACENT",
                    value:product(index(ri!case, "amount", {}),
                    index(
                      ri!case,
                      "newamount",
                      {}
                    ) / 100),
                    
                    readOnly: true(),
                  ),