Problems encountered when using the Mrif library

#include <SPI.h>
#include <Mirf.h>
#include <nRF24L01.h>
#include <MirfHardwareSpiDriver.h>



byte TXADDR[5] = {0xff, 0xff, 0xff, 0xff, 0xff};

void setup() {
  Serial.begin(115200);
  pinMode(10, OUTPUT);
  pinMode(9, OUTPUT);
  pinMode(2, INPUT);

  //Depending on the pins used in the hardware circuit
  Mirf.cePin = 10;    //CE
  Mirf.csnPin = 9;    //CSN
  Mirf.spi = &MirfHardwareSpi;
  Mirf.init();

  //Set the send destination The destination address is the receiver's own address
  Mirf.setTADDR((byte *)TXADDR);

  Mirf.payload = 32; //32-byte payload
  Mirf.channel = 0;   //2.4GHz
  Mirf.config();

  Serial.println("Beginning ... ");
}

uint8_t data_buff[32];

void loop() {
  //Read the sensor
  data_buff[0] = 10;
  data_buff[1] = '{';
  data_buff[2] = digitalRead(2)+'0';
  data_buff[3] = '}';
  data_buff[4] = '\r';
  data_buff[5] = '\n';

  //Set the sending destination
  Mirf.setTADDR((byte*)TXADDR);
  //Wireless Transmission Sending
  Mirf.send((byte*)data_buff);
  //Wait for sending to complete
  while (Mirf.isSending()) {
  }

  for (int i = 1; i < 5; i++)
  {
    Serial.print(data_buff);
  }
  Serial.println();
  //Time delay
  delay(100);
}