Update app.py

app.py

@@ -16,8 +16,13 @@ def plot_and_predict(zip, start_year, start_month, prediction_months):
     if not start_year.isdigit() or not (2000 <= int(start_year) <= current_year):
         return f"Error: Please enter a valid year between 2000 and {current_year}."
 
-    # Combine year and month into a start date
-    start_date = f"{start_year}-{start_month:02d}-01"
+    # Convert start_month to integer and combine year and month into a start date
+    try:
+        start_month_int = int(start_month)
+        start_date = f"{start_year}-{start_month_int:02d}-01"
+    except ValueError:
+        return "Error: Invalid start month. Please enter a numeric month between 1 and 12."
+
     start_date = pd.to_datetime(start_date)
 
     # Read and process the real estate data from Zillow