On attempting to log in to the hosted Workbench site https://workbench.developerforce.com with my force.com credentials, I am constantly getting an error that seems to be OAuth flow related. But I am unable to determine if the error is due to Salesforce not providing appropriate token to the Workbench or some other error.
Remote Access Authorization Error
There was a problem in setting up your remote access
The redirected URL is https://na15.salesforce.com/setup/secur/RemoteAccessErrorPage.apexp?oauth_error_code=1800&display=popup
What am I doing wrong?