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wtmt error 255

Hi a few times (in the range 1 of 100) the call to wtmt failed with "Build wtc failed: 255" see code snippet below. It is a NodeJS app that runs on Amazon EC2 Linux server. Any ideas what could cause this?

var wtc = spawn('sudo', );

wtc.on('exit', function (code) {

if (code !== 0) return callback('Build wtc failed: ' + code);

callback();

});