Task: Classify the mental state of the tweeter based on the tweet, determining if it is 'neutral or no emotion' or characterized by any of the provided emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust).
Tweet: One step forward, two steps backward, the link to RogerFedererShop doesn´t work.😰 I am losing hope about Roger Federer new Website #sadness
This tweet contains emotions: 
sadness