ESP8266EX along with Arduino Due rev3 to check wifi status

Hi i am using ESP8266EX along with Arduino Due rev3 to check wifi status. when i compile my following sketch compiler give me error User\Awais\Document\Arduino\liberaries\espsoftserialmaster\softserial.cpp:27:18: fatal error: gpio.h: no file or directory found any one help me solve this problem

    #include <SoftwareSerial.h>
    SoftwareSerial ESPserial (15,14); //RX|TX


     void setup() {
  // put your setup code here, to run once:

  Serial.begin(115200);
  ESPserial.begin(115200);
  Serial.println("NL & CR");
}

  void loop() {
 // put your main code here, to run repeatedly:

  if (ESPserial.available()){
   Serial.write(ESPserial.read());
  }

if (Serial.available()){
ESPserial.write(Serial.read());
}
  }