SoftwareSerial.h: No such file or directory Arduino Nano + DF player

I'm looking to play songs from a DF Player mini and for that I use the SoftwareSerial.h library but my code keeps compiling an error that it's not there. In addition, the error only appears when I use a nano 33 BLE card and not a standard nano one. I reinstalled Arduino IDE several times and even tried on another computer but nothing works

    #include "SoftwareSerial.h"
    #include "DFRobotDFPlayerMini.h"

    // Use pins 2 and 3 to communicate with DFPlayer Mini
    static const uint8_t PIN_MP3_TX = 4; // Connects to module's RX
    static const uint8_t PIN_MP3_RX = 6; // Connects to module's TX
    SoftwareSerial softwareSerial(PIN_MP3_RX, PIN_MP3_TX);

    // Create the Player object
    DFRobotDFPlayerMini player;

    void setup() {
      // Init USB serial port for debugging
      Serial.begin(9600);
      // Init serial port for DFPlayer Mini
      softwareSerial.begin(9600);

      // Start communication with DFPlayer Mini
      if (player.begin(softwareSerial)) {
        Serial.println("OK");

        // Set volume to maximum (0 to 30).
        player.volume(30);
        // Play the "0001.mp3" in the "mp3" folder on the SD card
        player.playMp3Folder(1);

      } else {
        Serial.println("Connecting to DFPlayer Mini failed!");
      }
    }

    void loop() {
    }