Cannot use Header file in the program

[luludada]

Once I include the header file in my program, the Arduino IDE keeps showing the error about

Arduino: 1.8.5 (Mac OS X), Board: "Arduino/Genuino Uno"

/Users/Mingyang/Desktop/Fingerprint-Sensor/Code/fingerprint/fingerprint.ino:1:29: fatal error: DYE_Fingerprint.h: No such file or directory
 #include <DYE_Fingerprint.h>
                             ^
compilation terminated.
exit status 1
Error compiling for board Arduino/Genuino Uno.

This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.

my code:

#include <DYE_Fingerprint.h>
// pin #2 is IN from sensor (GREEN wire)
// pin #3 is OUT from arduino  (WHITE wire)
#include <SoftwareSerial.h>
SoftwareSerial mySerial(2, 3);

DYE_Fingerprint finger = DYE_Fingerprint(&mySerial);

void setup()  
{
  Serial.begin(9600);
  while (!Serial);
  delay(100);
  Serial.println("\n\nfinger detect test");

  // set the data rate for the sensor serial port
  finger.begin(57600);
  
  if (finger.verifyPassword()) {
    Serial.println("Found fingerprint sensor!");
  } else {
    Serial.println("Did not find fingerprint sensor :(");
    while (1) { delay(1); }
  }
  Serial.println("Waiting for valid finger...");
}

void loop()                     // run over and over again
{
  getFingerprintIDez();
  delay(50);            //don't ned to run this at full speed.
}

uint8_t getFingerprintID() {
  uint8_t p = finger.getImage();
  switch (p) {
    case FINGERPRINT_OK:
      Serial.println("Image taken");
      break;
    case FINGERPRINT_NOFINGER:
      Serial.println("No finger detected");
      return p;
    case FINGERPRINT_PACKETRECIEVEERR:
      Serial.println("Communication error");
      return p;
    case FINGERPRINT_IMAGEFAIL:
      Serial.println("Imaging error");
      return p;
    default:
      Serial.println("Unknown error");
      return p;
  }

  // OK success!

  p = finger.image2Tz();
  switch (p) {
    case FINGERPRINT_OK:
      Serial.println("Image converted");
      break;
    case FINGERPRINT_IMAGEMESS:
      Serial.println("Image too messy");
      return p;
    case FINGERPRINT_PACKETRECIEVEERR:
      Serial.println("Communication error");
      return p;
    case FINGERPRINT_FEATUREFAIL:
      Serial.println("Could not find fingerprint features");
      return p;
    case FINGERPRINT_INVALIDIMAGE:
      Serial.println("Could not find fingerprint features");
      return p;
    default:
      Serial.println("Unknown error");
      return p;
  }
  
  // OK converted!
  p = finger.fingerFastSearch();
  if (p == FINGERPRINT_OK) {
    Serial.println("Found a print match!");
  } else if (p == FINGERPRINT_PACKETRECIEVEERR) {
    Serial.println("Communication error");
    return p;
  } else if (p == FINGERPRINT_NOTFOUND) {
    Serial.println("Did not find a match");
    return p;
  } else {
    Serial.println("Unknown error");
    return p;
  }   
  
  // found a match!
  Serial.print("Found ID #"); Serial.print(finger.fingerID); 
  Serial.print(" with confidence of "); Serial.println(finger.confidence); 

  return finger.fingerID;
}

// returns -1 if failed, otherwise returns ID #
int getFingerprintIDez() {
  uint8_t p = finger.getImage();
  if (p != FINGERPRINT_OK)  return -1;

  p = finger.image2Tz();
  if (p != FINGERPRINT_OK)  return -1;

  p = finger.fingerFastSearch();
  if (p != FINGERPRINT_OK)  return -1;
  
  // found a match!
  Serial.print("Found ID #"); Serial.print(finger.fingerID); 
  Serial.print(" with confidence of "); Serial.println(finger.confidence);
  return finger.fingerID; 
}`

the header file code:
`#ifndef DYE_FINGERPRINT_H
#define DYE_FINGERPRINT_H

#include "Arduino.h"
#if defined(__AVR__) || defined(ESP8266)
  #include <SoftwareSerial.h>
#endif

#define FINGERPRINT_OK 0x00
#define FINGERPRINT_PACKETRECIEVEERR 0x01
#define FINGERPRINT_NOFINGER 0x02
#define FINGERPRINT_IMAGEFAIL 0x03
#define FINGERPRINT_IMAGEMESS 0x06
#define FINGERPRINT_FEATUREFAIL 0x07
#define FINGERPRINT_NOMATCH 0x08
#define FINGERPRINT_NOTFOUND 0x09
#define FINGERPRINT_ENROLLMISMATCH 0x0A
#define FINGERPRINT_BADLOCATION 0x0B
#define FINGERPRINT_DBRANGEFAIL 0x0C
#define FINGERPRINT_UPLOADFEATUREFAIL 0x0D
#define FINGERPRINT_PACKETRESPONSEFAIL 0x0E
#define FINGERPRINT_UPLOADFAIL 0x0F
#define FINGERPRINT_DELETEFAIL 0x10
#define FINGERPRINT_DBCLEARFAIL 0x11
#define FINGERPRINT_PASSFAIL 0x13
#define FINGERPRINT_INVALIDIMAGE 0x15
#define FINGERPRINT_FLASHERR 0x18
#define FINGERPRINT_INVALIDREG 0x1A
#define FINGERPRINT_ADDRCODE 0x20
#define FINGERPRINT_PASSVERIFY 0x21

#define FINGERPRINT_STARTCODE 0xEF01

#define FINGERPRINT_COMMANDPACKET 0x1
#define FINGERPRINT_DATAPACKET 0x2
#define FINGERPRINT_ACKPACKET 0x7
#define FINGERPRINT_ENDDATAPACKET 0x8

#define FINGERPRINT_TIMEOUT 0xFF
#define FINGERPRINT_BADPACKET 0xFE

#define FINGERPRINT_GETIMAGE 0x01
#define FINGERPRINT_IMAGE2TZ 0x02
#define FINGERPRINT_REGMODEL 0x05
#define FINGERPRINT_STORE 0x06
#define FINGERPRINT_LOAD 0x07
#define FINGERPRINT_UPLOAD 0x08
#define FINGERPRINT_DELETE 0x0C
#define FINGERPRINT_EMPTY 0x0D
#define FINGERPRINT_SETPASSWORD 0x12
#define FINGERPRINT_VERIFYPASSWORD 0x13
#define FINGERPRINT_HISPEEDSEARCH 0x1B
#define FINGERPRINT_TEMPLATECOUNT 0x1D

//#define FINGERPRINT_DEBUG

#define DEFAULTTIMEOUT 1000  ///< UART reading timeout in milliseconds

///! Helper class to craft UART packets
struct DYE_Fingerprint_Packet {

/**************************************************************************/
/*!
    @brief   Create a new UART-borne packet
    @param   type Command, data, ack type packet
    @param   length Size of payload
    @param   data Pointer to bytes of size length we will memcopy into the internal buffer
*/
/**************************************************************************/

  DYE_Fingerprint_Packet(uint8_t type, uint16_t length, uint8_t * data) {
    this->start_code = FINGERPRINT_STARTCODE;
    this->type = type;
    this->length = length;
    address[0] = 0xFF; address[1] = 0xFF;
    address[2] = 0xFF; address[3] = 0xFF;
    if(length<64)
      memcpy(this->data, data, length);
    else
      memcpy(this->data, data, 64);
  }
  uint16_t start_code;      ///< "Wakeup" code for packet detection
  uint8_t address[4];       ///< 32-bit Fingerprint sensor address
  uint8_t type;             ///< Type of packet
  uint16_t length;          ///< Length of packet
  uint8_t data[64];         ///< The raw buffer for packet payload
};

///! Helper class to communicate with and keep state for fingerprint sensors
class DYE_Fingerprint {
 public:
#if defined(__AVR__) || defined(ESP8266)
  DYE_Fingerprint(SoftwareSerial *ss, uint32_t password = 0x0);
#endif
  DYE_Fingerprint(HardwareSerial *hs, uint32_t password = 0x0);

  void begin(uint32_t baud);

  boolean verifyPassword(void);
  uint8_t getImage(void);
  uint8_t image2Tz(uint8_t slot = 1);
  uint8_t createModel(void);

  uint8_t emptyDatabase(void);
  uint8_t storeModel(uint16_t id);
  uint8_t loadModel(uint16_t id);
  uint8_t getModel(void);
  uint8_t deleteModel(uint16_t id);
  uint8_t fingerFastSearch(void);
  uint8_t getTemplateCount(void);
  uint8_t setPassword(uint32_t password);
  void writeStructuredPacket(const DYE_Fingerprint_Packet & p);
  uint8_t getStructuredPacket(DYE_Fingerprint_Packet * p, uint16_t timeout=DEFAULTTIMEOUT);

  /// The matching location that is set by fingerFastSearch()
  uint16_t fingerID;
  /// The confidence of the fingerFastSearch() match, higher numbers are more confidents
  uint16_t confidence;
  /// The number of stored templates in the sensor, set by getTemplateCount()
  uint16_t templateCount;

 private:
  uint8_t checkPassword(void);
  uint32_t thePassword;
  uint32_t theAddress;
    uint8_t recvPacket[20];

  Stream *mySerial;
#if defined(__AVR__) || defined(ESP8266)
  SoftwareSerial *swSerial;
#endif
  HardwareSerial *hwSerial;
};

#endif

[per1234]

This issue tracker is only to be used to report bugs or feature requests. This topic is more appropriate for the Arduino Forum. I'm sure we'll be able to help you with your problem over there.

Please do this:

1. Read http://forum.arduino.cc/index.php?topic=148850
2. If you haven't already done so, create a new thread in the appropriate section of the forum (http://forum.arduino.cc/), following all the rules. Be sure to post your code, using code tags (</> button on the toolbar).