Update app.py

app.py

@@ -52,8 +52,7 @@ def allowed_file(filename):
 
 @app.route('/')
 def index():
-    uploaded_file = session.get('uploaded_file', None)
-    return render_template('upload.html',uploaded_file)
+    return render_template('upload.html')
 
 @app.route('/guide')
 def guide():