I try to take the favourite count filter for a question.
I use api through R
library(stackr) stack_questions(11227809, site = "stackoverflow", filter = "!GeD4JB*YQqe2L")
and I try to take the filter as this way
However I receive this error
Error in !metadata$has_more : invalid argument type
Also I tested the filter in api but again it gives an empty string.