No such memory, or...?

on my f3discovery i write:

function delays(s){var n=1000; while(n--){}}

spi = new SPI();

spi.setup({sck:A5, miso:A6, mosi:A7});
var nrf = require("NRF24L01P").connect( spi, B0, B1 );
function onInit() {
  nrf.init([0,0,0,0,2], [0,0,0,0,1]);
}

onInit();

setInterval(function() {
  nrf.masterHandler();
}, 50);
function g1on(){digitalWrite(B9,1);}
function g1of(){digitalWrite(B9,0);}

//function a1on(){digitalWrite(B8,1);}

it works ok, but if I try to add the last (commented) line it doesnt work -
download process doesn't finish properly. - no "=undefined" string.
process.memory() shows nothing criminal -

>process.memory()
={"free":1306,"usage":414,"total":1720,"­history":249,"stackEndAddress":536906916­,"flash_start":134217728,"flash_binary_e­nd":134371320,"flash_code_start":1344450­56,"flash_length":262144}

what can be? thanks!