Update app.py

app.py

@@ -50,7 +50,9 @@ if df1_upload is not None and df2_upload is not None:
         columns_df2 = df2.columns.tolist()
         selected_columns_df1 = st.multiselect("Select columns from DataFrame 1 to match on:", columns_df1, default=columns_df1[0])
         selected_columns_df2 = st.multiselect("Select columns from DataFrame 2 to match on:", columns_df2, default=columns_df2[0])
-        st.write(selected_columns_df1)
+        selected_columns_df1 = list(selected_columns_df1.values())
+        selected_columns_df2 = list(selected_columns_df2.values())
+
          # Perform merge
         if st.button("Merge DataFrames"):
             model=lt.LinkTransformer(model_path)