Frustrating experience in using OAuth


This is pretty frustrating. I can’t imagine I am stuck in this problem for a couple days and no one is able to help me.

I am using twitteR to get a PIN

API_key <- 'aaaaa’
API_secret <- 'bbbbbb’
cred = getTwitterOAuth(API_key, API_secret)

To enable the connection, please direct your web browser to:
When complete, record the PIN given to you and provide it here:

I am just cut & paste the URL to my browser (have tried Firefox, Safari, Chrome). All return a blank page.