need help with a translation issue

[Quentin Bock]

I'm trying to take the user input and let them change the target language
or dest
code:

from deep_translator import GoogleTranslator
import googletrans
import sys

language_list = googletrans.LANGUAGES
print(language_list)

feedback = input("Would you like to translate a sentence of your own?
(yes/no)")

if feedback == 'no':
    sys.exit()

while feedback == 'yes':

    user_choice = input ("Enter a language (the abbreviation or correctly
spelled name of the language): ").lower()

    user_sentence = input("Enter a sentence you want translated: ")

    user_translation = GoogleTranslator(source='en',
target=user_choice).translate(user_sentence)

    print(user_translation)

    feedback = input ("Would you like to translate a sentence of your own?
(yes/no)")

    if feedback == 'no':
        sys.exit()
when ran, this will bring an error saying that your inputted language is
not supported
why is this?