FreqMeasure LiquidCrystal Library Coding Error

hi, doing project on speed sensor , looked code. found 1 downloaded libraries specified error came up. code:

code: [select]

#include "freqmeasure/freqmeasure.h"
#include <liquidcrystal.h>

liquidcrystal lcd(12, 11, 5, 4, 3, 2);

void setup() {
  serial.begin(57600);
  lcd.begin(16, 2);
  lcd.print("freq:");
  lcd.setcursor(10,0);
  lcd.print("speed:");
  freqmeasure.begin();
}

double sum=0;
int count=0;

void loop() {
  if (freqmeasure.available()) {
    // average 30 readings together
    sum = sum + freqmeasure.read();
    count = count + 1;
    if (count > 30) {
      float frequency = freqmeasure.counttofrequency(sum / count);
      float spd = frequency / 19.49; //conversion frequency kilometers per hour (sorry, imperial guys :)
      //to improve speed, update bottom row of lcd
      lcd.setcursor(0, 1);
      lcd.print("                ");
      lcd.setcursor(0, 1);
      lcd.print(frequency);
      lcd.print("hz");
      //lcd.print("       ");
      lcd.setcursor(8,1);
      lcd.print(spd);
      lcd.print("km/h");
      sum = 0;
      count = 0;
    }
  }
}/code]
 

the error:

arduino: 1.8.3 (mac os x), board: "arduino/genuino uno"

/var/folders/7q/2mrctx594tz5s16j969ffptr0000gn/t/arduino_modified_sketch_241204/sketch_jul02a.ino:1:37: fatal error: freqmeasure/freqmeasure.h: no such file or directory
 #include "freqmeasure/freqmeasure.h"
                                     ^
compilation terminated.
exit status 1
error compiling board arduino/genuino uno.

this report have more information with
"show verbose output during compilation"
option enabled in file -> preferences.

can me?

can help?

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