fixing hasher

src/streamlit_app.py

@@ -30,7 +30,8 @@ if 'users_config' not in st.session_state:
 def create_default_users():
     """Create default users configuration"""
     # Hash passwords using the correct syntax
-    hashed_passwords = stauth.Hasher(['admin123', 'teacher123', 'student123']).generate()
+    hasher = stauth.Hasher()
+    hashed_passwords = hasher.generate(['admin123', 'teacher123', 'student123'])
     
     default_users = {
         'credentials': {