Update utils.py

utils.py

@@ -46,6 +46,7 @@ def encode(image_name, secret_data,txt=None):
             break    
     secret_data = secret_data1    
     if len(secret_data) > n_bytes:
+        msg ="Watermark is too large for Image Size"
         return image_name,msg
     secret_data += "====="
     data_index = 0