dfplayer wiring to arduino nano using rx and tx and code issue

Using Arduino Programming Questions
18

I am not sure what i am doing wrong, ive tested the dfplayer without the arduino and it works.

#include <DFPlayer_Mini_Mp3.h>
#include <SoftwareSerial.h>

SoftwareSerial dfPlayer(7, 4); // RX, TX
 
void setup () {
 Serial.begin (9600);
 dfPlayer.begin(9600);
 mp3_set_serial (dfPlayer); //set SoftwareSerial for DFPlayer-mini mp3 module
 mp3_set_volume (80);
}


 
void loop () {       
 
 mp3_play (1); //play 0001.mp3
 delay (10000); //10 sec, time delay to allow 0001.mp3 to finish playing
 
 mp3_play (2);
 delay (5000);
 
}