improved error message

source/RobotAPI/libraries/ArmarXEtherCAT/EtherCAT.cpp

@@ -451,7 +451,7 @@ std::pair<std::vector<ControlDevicePtr>, std::vector<SensorDevicePtr>> EtherCAT:
         catch (LocalException& e)
         {
             ARMARX_WARNING
-                    << messageSlaveIdentifier << e.getReason();
+                    << "error during slave creation: " << messageSlaveIdentifier << e.getReason();
             continue;
         }
         if (!foundDevice)