updated app

app.py

@@ -128,7 +128,7 @@ elif app_selector == "Collaborative Recommender":
 
         # User input
         if collaborative_method == "Surprise Collaborative Filtering" or collaborative_method == "User-Based Collaborative Filtering": 
-            usernames = anime_user_ratings['usernames'].unique()  
+            usernames = anime_user_ratings['username'].unique()  
             username = st.selectbox("Choose a user, and we'll show you animes they'd recommend!", usernames) 
             n_recommendations = st.slider("Number of Recommendations:", min_value=1, max_value=50, value=10)
         elif collaborative_method == "Anime-Based KNN Collaborative Filtering":