Pipeline doest seem to work with mbart

I was trying to infer the output for mbart utilizing the transformers utility function, pipeline. Below is the code for the same

model_check_point= "facebook/mbart-large-cc25"

en2_fr_translator = pipeline("translation_en_to_fr", model=model_check_point)

en2_fr_translator("How old are you?") 

Interestingly, this code works perfectly with t5-base, why do I observe such behavior from the pipeline?