What i'm saying is. Accounts that have been inactive for a considerable amount of time tend to get removed for various reasons. This may have happened to your account 'Chester'. Any way as said numerous times, you should contact an SAMP Manager or even the owners they will see if you account does in fact still exist or not they will deal with password recovery if it does, if it does not will most likely give permission to set up a new account.
Message Gandalf about this as is currently activeo n the forums