Please confirm that the Twitter account you are logged into on your browser app is the same as the one you wish to link with Walkr.

For example: If you've linked your Walkr account with Twitter Account A but have logged into the Twitter Account B on browser app, you will be unable to log into Walkr.
To resolve this issue:
1. Open the browser app and log out of your Twitter account
2. Return to Walkr, use the correct Twitter account to log in