Translation:On the white paper there is one word.
I thought there was no 'e' ending for adjectives of het-words.
Take a look at the explanation here: https://www.duolingo.com/comment/3888221
If the indefinite article ”een" comes before a het-word in the singular, then the adjective does not get the -e ending. Dus:
het witte papier
een wit papier