Error in content$data[[1]]$id : $ operator is invalid for atomic vectors

[zadwhite]

i'm trying to run InstaR package with R Studio. After install all neccessary package and have a token, i try to run
> **instaf <- getFollows("zadwhitecloud", token)

**
but it raise this error "Error in content$data[[1]]$id : $ operator is invalid for atomic vectors"
Any one can help me, pls? how to fix this?