JESS: Use deffacts in assert object in slot value

[Nopphadol Chalortham]

I would like to assert facts to the jess working memory by deffacts as
below;

          This is my template's facts.



          *(deftemplate person     (slot name)*

*          (slot age))*

*          (deftemplate couple     (slot husband (type object))*

*(slot wife (type object)))*

So, I would like to insert two persons(john and marry)and a couple as below:


          (deffacts initfacts

          (person (name John)(age 38))

          (person (name Marry)(age 36))

          (couple       (hasband (person (name John)(age 38)) )

(wife  (person (name Marry)(age 36)) ))

)



But it has an error message: Undefined function person.

How can I solve this problem?