Update app.py

app.py

@@ -198,7 +198,7 @@ def analyze_transaction_with_ai(transaction_data, suspicious_transactions, colum
 def load_and_preprocess_data(file):
     """Load and preprocess transaction data from CSV or Excel file"""
     if file is None:
-        return None, None
+        return None, None, None  # Return three values instead of two
     
     # Get file extension
     file_extension = os.path.splitext(file.name)[1].lower()
@@ -220,7 +220,7 @@ def load_and_preprocess_data(file):
     
     # If LLM analysis failed, perform basic preprocessing
     if column_mapping is None:
-        return df, dataset_explanation
+        return df, dataset_explanation, None  # Return three values with column_mapping as None
     
     # Process the data based on identified columns
     processed_df = df.copy()