Update app.py

app.py

@@ -33,7 +33,7 @@ title = st.text_area("Title ", "", height=100)
 abstract = st.text_area("Abstract ", "", height=150)
 
 if st.button("Классифицировать", key="manual"):
-    if len(title_text) == 0:
+    if len(title) == 0:
         st.error("Please, provide paper's title")
     else:
         with st.spinner("Be patient, I'm doing my best"):