wxianfeng-2:sms wangxianfeng$ node app
Express server listening on port 3000

buffer.js:236
    throw new Error('First argument needs to be a number, ' +
          ^
Error: First argument needs to be a number, array or string.
at new Buffer (buffer.js:236:15)
at exports.weibo_login.base64Encode                (/data/nodejs/sms/node_modules/sinalogin/lib/index.js:70:12)
at exports.weibo_login.getWeiboRsa (/data/nodejs/sms/node_modules/sinalogin/lib/index.js:79:12)
at async.iterator.fn (/data/nodejs/sms/node_modules/sinalogin/node_modules/async/lib/async.js:579:34)
at async.waterfall.wrapIterator (/data/nodejs/sms/node_modules/sinalogin/node_modules/async/lib/async.js:495:34)
at process.startup.processNextTick.process._tickCallback (node.js:244:9)

上面是我出错的 log, 堆栈始终只打印 module 中的代码, 我 项目中哪行代码导致的， 为什么没有呢?