rookie mistake

a basic mistake, like one that a person with no experience of an activity would make
یک اشتباه اساسی، مانند اشتباهی که فردی بدون تجربه در یک فعالیت مرتکب می شود
Although he's an experienced movie director, he made the rookie mistake of trying to cram too much material into a mere 100 minutes
... [مشاهده متن کامل]

منابع

• https://dictionary.cambridge.org/dictionary/english/rookie-mistake

ناشی گری، اشتباه مبتدیانه و ناشیانه