Update app.py

app.py

@@ -95,6 +95,7 @@ col1, col2 = st.columns([1, 2], gap="medium")
 incorrect = 0
 is_better_run1_count = 0
 is_better_run2_count = 0
+checkboxes = None
 with col1:
     st.title("Instances")
     if run1_file is not None:
@@ -141,7 +142,7 @@ with col1:
 
 
 with col2:
-    st.title(f"Information ({len(checkboxes) - 1}/{len(name_of_columns) - 1})")
+    st.title(f"Information ({len(checkboxes) - 1 if checkboxes else 0}/{len(name_of_columns) - 1})")
     ### Only one run file
     if run1_file is not None and run2_file is None:
         for check_idx, (inst_num, checkbox) in enumerate(checkboxes):