'MIDI' was not declared in this scope

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Sorry, I've just copied the error message.

Here is the code:
/*

  • This program is free software; you can redistribute it and/or modify
  • it under the terms of the GNU General Public License as published by
  • the Free Software Foundation; either version 2 of the License, or
  • (at your option) any later version.
  • This program is distributed in the hope that it will be useful,
  • but WITHOUT ANY WARRANTY; without even the implied warranty of
  • MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  • GNU General Public License for more details.
  • You should have received a copy of the GNU General Public License
  • along with this program. If not, see http://www.gnu.org/licenses/

*/

#include <MIDI.h>
#include <Usb.h>
#include <usbh_midi.h>

//Workaround for Arduino MIDI library v4.0 compatibility
#ifdef USE_SERIAL_PORT
#define _MIDI_SERIAL_PORT USE_SERIAL_PORT
#else
#define _MIDI_SERIAL_PORT MIDI_DEFAULT_SERIAL_PORT
#endif

//////////////////////////
// MIDI Pin assign
// 2 : GND
// 4 : +5V(Vcc) with 220ohm
// 5 : TX
//////////////////////////

USB Usb;
USBH_MIDI Midi(&Usb);

void MIDI_poll();
void doDelay(unsigned long t1, unsigned long t2, unsigned long delayTime);

void setup()
{
MIDI.begin(MIDI_CHANNEL_OMNI);

//Workaround for non UHS2.0 Shield
pinMode(7,OUTPUT);
digitalWrite(7,HIGH);

if (Usb.Init() == -1) {
while(1); //halt
}//if (Usb.Init() == -1...
delay( 200 );
}

void loop()
{
unsigned long t1;
uint8_t msg[4];

Usb.Task();
t1 = micros();
if( Usb.getUsbTaskState() == USB_STATE_RUNNING )
{
MIDI_poll();
if (MIDI.read()) {
msg[0] = MIDI.getType();
if( msg[0] == 0xf0 ) { //SysEX
//TODO
//SysEx implementation is not yet.
}else{
msg[1] = MIDI.getData1();
msg[2] = MIDI.getData2();
Midi.SendData(msg, 0);
}
}
}
//delay(1ms)
doDelay(t1, micros(), 1000);
}

// Poll USB MIDI Controler and send to serial MIDI
void MIDI_poll()
{
byte outBuf[ 3 ];
uint8_t size;

if( (size=Midi.RcvData(outBuf)) > 0 ){
//MIDI Output
_MIDI_SERIAL_PORT.write(outBuf, size);
}
}

// Delay time (max 16383 us)
void doDelay(unsigned long t1, unsigned long t2, unsigned long delayTime)
{
unsigned long t3;

if( t1 > t2 ){
t3 = (4294967295 - t1 + t2);
}else{
t3 = t2 - t1;
}

if( t3 < delayTime ){
delayMicroseconds(delayTime - t3);
}
}