Please make sure that the correct username (email) and password have been entered. Some browsers offer the option to pre-fill the login data (username and password). If these have already been filled in, the browser may try to use old login credentials. Therefore, please replace them with your current username and password.
Do you need a new password? In the log-in area under "Forgot your password?”, you will find the option to request a new one. Alternatively, you can also request a new password here.