Unable to read JSON file from rtweet

Question

I'm using the Rtweet package to collect streamed tweets from Twitter API. Using the following code to collect data:

stream_tweets(
  q = "",
  timeout = 10,
  file_name = "sample.json",
  parse = FALSE
)
sample <- parse_stream("sample.json")
save(sample, file = "sample_live.Rda")

Issue: The json file that is saved in my directory is working fine and contains streamed tweets data. However, when I try to load my converted Rda file in R, R just returns NULL:

> sample
NULL
> dim(sample)
NULL

Any ideas on how to solve this issue?

Thanks!