Connection error is sometimes created by long wires used between the Arduino and NRF24 module. SPI works at a fast rate so use short wires and also wind GND around the MISO and MOSI wires. Also, add a 10uF cap between 3.3 and GND.
ALSO, VERY important. Don't use the 3.3V from Arduino. It can't deliver too much current. Use external voltage regulator. Keep up!