Modify signature of process_message according to the YAT4Tango lib :

virtual void process_message (yat::Message& msg) throw (Tango::DevFailed)

src/AxisSimulatorTask.cpp

@@ -70,7 +70,7 @@ AxisSimulatorTask::~AxisSimulatorTask (void)
 // ============================================================================
 // AxisSimulatorTask::process_message
 // ============================================================================
-void AxisSimulatorTask::process_message (yat::Message& _msg)
+void AxisSimulatorTask::process_message (yat::Message& _msg) throw (Tango::DevFailed)
 {
     //- handle msg
     switch (_msg.type())

src/AxisSimulatorTask.h

@@ -154,7 +154,7 @@ public:
 protected:
   
 	//- process_message (implements yat4tango::DeviceTask pure virtual method)
-	virtual void process_message (yat::Message& msg);
+	virtual void process_message (yat::Message& msg) throw (Tango::DevFailed);
 
 private: