Possibly? Without knowing the timeline and when you asked for help, how long you've been there, how much supervision you should have or not and how unhappy the client was it's hard to make any concrete judgement. Work is a harsh. You'd be best speaking to your line manager. Ask for a debrief and state you want to avoid this happening again and be able to give your best. At the end of the day your employers want the best you can give them too so sitting down and talking about how to maximise your contribution is a good step