get_intraday_data error

[gokt0002]

Thank you for this package. I was looking for something just like this.

This code:
df = get_intraday_data(cookie, what="heart-rate", date="2018-06-23")

gives me the error below:

Error in curl::handle_setopt(handle, .list = req$options) :
Value for option cookie (10022) must be length-1 string

Could it be because I only have 4 days of data, not a week yet? I can't think of anything else. I am not an advanced R user, so appreciate any help.
Thank you