I am using OAuth to login and tweet to a users twitter account from a native iOS app. I initially used my clients existing key and secret for this, which let me log on successfully, but the account was read only and so I was unable to post updates. They created a read/write account for me and I replaced the old key/secret with the new ones. Now when I try and log in, I get taken to a page with the following message:
This page is no longer valid. It looks like someone already used the token information you provided. Please return to the site that sent you to this page and try again … it was probably an honest mistake."
What does this message mean, and how can I resolve the issue?