JESS: help with defrule

[Jeffrey Hau]

i have defined a rule as follows,

(defrule goal-reached ""
   (act (a ?x) (b ?y)
   ?n <- (target (a ?x) (b ?y))
   =>
   (retract ?n)
)
what i am trying to do to fire the rule when there is a act fact that 
matches the target fact, and then retract the target but i keep getting 
"expected =>" when parsing my file,

can anyone help?

thanks very much

Jeff

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