Update app.py

app.py

@@ -176,8 +176,8 @@ def main():
         if st.button("Grade Proposal"):
             if new_file:
                 result = grade_essay(input = new_file)
-                txt = txt.replace("\n", "")
-                df = pd.read_json(txt)
+                result = result.replace("\n", "")
+                df = pd.read_json(result)
                 df = df.T
                 # Store results in session state
                 st.session_state.results.append({