diff --git a/cube/User/Src/main2.c b/cube/User/Src/main2.c
index 600ccba..d032e89 100644
--- a/cube/User/Src/main2.c
+++ b/cube/User/Src/main2.c
@@ -69,6 +69,7 @@ void HAL_UART_TxCpltCallback(UART_HandleTypeDef *huart) {
     }
 #endif //LOGGER_OUTPUT_BY_INTERRUPT    
 #if NETWORK_STACK == 2
+#error NETWORK_STACK 2
     if (huart == &modemUart) {
         modemTxCpltCallback(huart);
     }