diff --git a/pykirdy/driver/kirdy.py b/pykirdy/driver/kirdy.py
index 876f5ca..860e14b 100644
--- a/pykirdy/driver/kirdy.py
+++ b/pykirdy/driver/kirdy.py
@@ -642,6 +642,7 @@ class Kirdy:
         # PyQt Signal
         self._report_sig = None # Dict
         self._connected_sig = None # Bool
+        self._err_msg_sig = None # Str
         
         self.connected_event = None
 
@@ -662,6 +663,12 @@ class Kirdy:
         """
         self._connected_sig = sig
 
+    def set_err_msg_sig(self, sig):
+        """
+            Emit a error message to a PyQt Signal(str) when a cmd fails to execute
+        """
+        self._err_msg_sig = sig
+
     def start_session(self, host='192.168.1.128', port=1337):
         """
             Start Kirdy Connection Session.
@@ -900,6 +907,10 @@ class Kirdy:
         elif msg["msg_type"] == msg_type:
             if sig is not None:
                 sig.emit(msg)
+        else:
+            logging.warn(f"Commands fail to execute. {msg['msg_type']}:{msg['msg']}")
+            if self._err_msg_sig is not None and msg['msg'] is not None:
+                self._err_msg_sig.emit(msg['msg'])
         return msg
 
     async def _send_raw_cmd(self, cmd, msg_type="Acknowledge", sig=None):