Update app.py

app.py

@@ -5,7 +5,7 @@ import streamlit as st
 @st.cache()
 def load_all_usernames():
     list_of_usernames = load_dataset("bigcode/the-stack-usernames", split="train")["usernames"]
-    return set(list_of_repo_names)
+    return set(list_of_usernames)
 
 st.title("Am I in The Stack?")
 st.markdown("This tool lets you check if a repository under a given username is part of [The Stack dataset](https://huggingface.co/datasets/bigcode/the-stack).")