[R] svyglm question

[haps]

I formed a survey design as: 
> library(survey) 
> mydesign <- svydesign(ids=~vill_neigh_code+clust, strata=~strat,
> weights=~sweight, data=mydata) 
where 
strat: stratum (urban or (sub-county) rural). 
clust: batch of interviews that were part of the same random walk 
vill_neigh_code: village or neighbourhood code 
sweight: probability weights 

Then, I run a logistic regression as 
> logit.1 <- svyglm(response~var1+var2+var3+var4+var5+var6, design=mydesign,
> data=mydata, family=quasibinomial()) 
And I get this error message: 
Error in svyglm.survey.design(response ~ var1 + var2 + var3 + var4 +  : 
  all variables must be in design= argument 
What should I change in the syntax in this case?

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