[R] function ctree in package party

[Maxl18]

Hi,
I have a problem with the function ctree in the package party.

When I launch ctree with weights=NULL it works.
ctree(function~var1+var2, data=datalist, weights=NULL,
controls=ctree_control(mincriterion=0.95, maxdepth=4,
teststat="quad",testtype="Bonferroni"))

But when I try
ctree(function~var1+var2, data=datalist, weights=var3,
controls=ctree_control(mincriterion=0.95, maxdepth=4,
teststat="quad",testtype="Bonferroni"))
there`s an error message
error in model at fit(data,...) : object "var3" not found

What should I do? Thanks
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