Update app.py

app.py

@@ -90,6 +90,12 @@ with gr.Blocks() as demo:
     balance_output = gr.Textbox(label="Balance Sheet", lines=10)
 
     def process_file(trial_balance_file, mapping_file):
+        # Check if files are uploaded
+        if trial_balance_file is None:
+            return "Error: Please upload a trial balance Excel file.", None
+        if mapping_file is None:
+            return "Error: Please upload a mapping file.", None
+        
         try:
             mapping = load_mapping(mapping_file)
             income_statement, balance_sheet = generate_financial_statements(trial_balance_file, mapping)