rhinoscript about intersectbreps

[Thiru]

Hey folks i know it isnt a rhinoscript group, but i know many of you
are hardcore scripters, so i try to ask.

I have tried to get the intersecting curves of a bunch of breps, with
the intersectingbreps method.

For i = 0 To UBound(CollecCir,1)
                For j = 0 To UBound(CollecCir,2)

        233             sectLine1 = 
Rhino.IntersectBreps(CollecCir(i,j),CollecCir(i
+1,j))
        234             sectline2 = 
Rhino.IntersectBreps(CollecCir(i,j),CollecCir(i,j
+1))

Next
next

But only runs down to 233, get the intersecting curve and I get an
error Message "string required", i tried to delete line 234, but the
same it only runs 233 once, I tried to intersect CollecCir(i+5,j
+5),CollecCir(i+6,j+5))
it worked again only once...

Any one got an idea, what could be wrong, or what i should be aware of
when running intersectbreps.
Im quite new to rhinoscript,

Any way Thx