nrf24l01 question marks

Hello ! I have two nrf24l01. The receiver is a arduino nano and the transmitter is a arduino micro. When i turn them on, the arduino micro dosen't flash any led but the arduino nano flashes the tx led very fast. On the serial monitor i only see question marks.
My code:
Reciever

/*

  • Arduino Wireless Communication Tutorial
  • Example 1 - Receiver Code
  • by Dejan Nedelkovski, www.HowToMechatronics.com
  • Library: TMRh20/RF24, GitHub - nRF24/RF24: OSI Layer 2 driver for nRF24L01 on Arduino & Raspberry Pi/Linux Devices
    */
    #include <SPI.h>
    #include <nRF24L01.h>
    #include <RF24.h>
    RF24 radio(7, 8 ); // CE, CSN
    const byte address[6] = "00001";
    void setup() {
    Serial.begin(9600);
    radio.begin();
    radio.openReadingPipe(0, address);
    radio.setPALevel(RF24_PA_MIN);
    radio.startListening();
    }
    void loop() {
    if (radio.available()) {
    char text[32] = "";
    radio.read(&text, sizeof(text));
    Serial.println(text);
    }
    }

Transmitter

/*

Wiring (same on both arduinos)