Trouble with plotting roc curve(yardstick) in some models

[lucaszago]

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In the version dated "2018-05-12", capitalization in article/book names are inconsistent. Also, sometimes initials are used for names, sometimes not: 

> Agresti, Alan. 2012. Categorical Data Analysis. Wiley-Interscience.
> Altman, D. 1991. “Categorising Continuous Variables.” British Journal of Cancer, no. 5:975.

[lucaszago]

I`m new in r, and I was not really sure which place I could post my doubt:

I was trying to do a roc curve for 2 models:

knn_res %>%
unnest(.predictions) %>%
mutate(model ="kknn") %>% #adicionando uma coluna
bind_rows(tree_res %>%
unnest(.predictions) %>%
mutate(model ="rpart")) %>%
group_by(model) %>%
roc_curve(new_renda, .pred_abaixo) %>%
autoplot()

And I received this error: Error in roc.default(response = integer(0), predictor = numeric(0), levels = c("acima", :
No control observation.

Could you help me how to solve it?