1d periodic structure.

   Hi all,
           My question might be easy but I am new to photonic crystal and mpb.
  I have written a simple (I hope) ctl file and it does not seem to run. I would
be grateful is you can spot something wrong with the ctl file below

(set! resolution 1024)
(define-param eps1 12)
(define-param eps2 5.45)
(set! geometry-lattice (make lattice (size 1 no-size no-size)))

(define-param d1 0.3)
(define-param d2 0.3)

(set! default material (make dielectric (epsilon eps2)))

(set! geometry (list (make block (center 0)
(size d1 infinity infinity) (material (make dielectric (epsilon eps1))))))

(set! k-points (list (vector3 0) (vector3 0.5)
(set! k-points (interpolate k-points 9))
 (set-param! num-bands 5)
 (run-tm)


 I get an error that says

ERROR: In procedure set!:
ERROR: missing or extra expression

 in my output file. 

  One more thing , what is meant by " quarter-wave thickness or
half-wave-thickness) I have seen Steven use it in example ctl but I dont
understand what it really  means. Help is greatly appreciated.
Cheers.