fix variable

app.py

@@ -22,10 +22,10 @@ button = st.button("Extract")
 with st.spinner("Processing Text  and Extracting..."):
     if button and text:
         # extract markers from the text
-        spans = model.extract_span(sentence)
-        markers = model.extract_marker(sentence)
-        values = model.extract_value(sentence)
-        ners = model.extract_ner(sentence)
+        spans = model.extract_span(text)
+        markers = model.extract_marker(text)
+        values = model.extract_value(text)
+        ners = model.extract_ner(text)
 
         # display the result
         st.markdown("**Spans:**")