AsyncEventSource events("/events"), does not work!

[MalushSasha]

I'm trying to repeat the example with the "ESPAsyncWebServer" library. When adding a line to the project: // AsyncEventSource events("/events"); Gives the following message. What could be the reason? Thanks in advance.

c:/users/zav/.platformio/packages/toolchain-xtensa-esp32/bin/../lib/gcc/xtensa-esp32-elf/8.4.0/../../../../xtensa-esp32-elf/bin/ld.exe: .pio\build\esp32doit-devkit-v1\libae0\libESP Async WebServer.a(WebAuthentication.cpp.o):(.literal._ZL6getMD5PhtPc+0x4): undefined reference to `mbedtls_md5_starts'

c:/users/zav/.platformio/packages/toolchain-xtensa-esp32/bin/../lib/gcc/xtensa-esp32-elf/8.4.0/../../../../xtensa-esp32-elf/bin/ld.exe: .pio\build\esp32doit-devkit-v1\libae0\libESP Async WebServer.a(WebAuthentication.cpp.o): in function `getMD5(unsigned char*, unsigned short, char*)':

E:\Arduino\webserver\ESP32_wifi_serv/.pio/libdeps/esp32doit-devkit-v1/ESP Async WebServer/src/WebAuthentication.cpp:73: undefined reference to `mbedtls_md5_starts'
collect2.exe: error: ld returned 1 exit status
*** [.pio\build\esp32doit-devkit-v1\firmware.elf] Error 1

#include <Arduino.h>
#include <WiFi.h>
#include <DHT.h>
#include <Adafruit_Sensor.h>
#include "ESPAsyncWebServer.h"
// #include "SPIFFS.h"
#include <Arduino_JSON.h>
#include <AsyncTCP.h>
#include "LittleFS.h"

const char* ssid     = "jadina hahol";
const char* password = "zaharhvulka";
uint8_t DHTPIN = 4;
DHT dht(DHTPIN, DHT22);
const int ledPin = 2; 
float Temperature;
float Humidity; 

unsigned long lastTime = 0;
unsigned long timerDelay = 2000;
IPAddress local_IP(192,168,12,12);
IPAddress gateway(192,168,12,12); 
IPAddress subnet(255,255,255,0);
AsyncWebServer server(80);  

// AsyncEventSource events("/events");

Platformio.ini

[env:esp32doit-devkit-v1]
platform = espressif32
board = esp32doit-devkit-v1
monitor_speed = 115200
framework = arduino
board_build.filesystem = littlefs
lib_deps = 
    arduino-libraries/Arduino_JSON@^0.1.0
    me-no-dev/ESP Async WebServer@^1.2.3
    ; me-no-dev/AsyncTCP;@^1.1.1
    adafruit/DHT sensor library@^1.4.3
    adafruit/Adafruit Unified Sensor@^1.1.5

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