error : does not name a type (PCA9685)

[LVB1961]

Hello ,
I tried something with a servo and a PCA9685 board by using the sketch underneath :
Everytime i want to compile i get the error:
'PCA9685_ServoEvaluator' does not name a type...
I downloaded the newest drive but the error remains .
I do not know how to go any further because i only started with Arduino this year ...
Can anyone put me on the right track in this one ?
Thans ,
Best regards ,
Luc

/*
Servo Motor Control using Arduino and PCA9685 Driver
by Dejan, https://howtomechatronics.com

 Library: https://github.com/NachtRaveVL/PCA9685-Arduino

*/

#include <Wire.h>
#include "PCA9685.h"

PCA9685 driver;

//PCA9685 outputs = 12-bit = 4096 steps
// 2.5% of 20ms = 0.5ms ; 12.5% of 20ms = 2.5ms
// 2.5% of 4096 = 102 steps; 12.5% of 4096 = 512 steps
PCA9685_ServoEvaluator pwmServo(102, 470); // (-90deg, +90deg)

// Second Servo
// PCA9685_ServoEvaluator pwmServo2(102, 310, 505); // (0deg, 90deg, 180deg)

void setup() {
Wire.begin(); // Wire must be started first
Wire.setClock(400000); // Supported baud rates are 100kHz, 400kHz, and 1000kHz
driver.resetDevices(); // Software resets all PCA9685 devices on Wire line
driver.init(B000000); // Address pins A5-A0 set to B000000
driver.setPWMFrequency(50); // Set frequency to 50Hz
}
void loop() {
driver.setChannelPWM(0, pwmServo.pwmForAngle(-90));
delay(1000);
driver.setChannelPWM(0, pwmServo.pwmForAngle(0));
delay(1000);
driver.setChannelPWM(0, pwmServo.pwmForAngle(90));
delay(1000);
}