LMiC ABP example not working

Hello. I am trying to test out the ABP example, but I get this in the serial monitor:
Starting
FAILURE
\Arduino\libraries\arduino-lmic-master\src\lmic\radio.c:689

I am using Arduino Uno R3 with Elecrow RFM95 Lora Shield.

Maybe the Pin mapping is not correct? I have no idea how to configure this:
// Pin mapping
const lmic_pinmap lmic_pins = {
.nss = 6,
.rxtx = LMIC_UNUSED_PIN,
.rst = 5,
.dio = {3, 4, LMIC_UNUSED_PIN},
};

Any help would be appreciated.