Steem js出现"Expected version 128, instead got 149"的问题

我按照例子https://github.com/steemit/steem-js/blob/master/examples/broadcast.html调用steem.js 的steem.broadcast.comment函数时出现Expected version 128, instead got 149，我的例子如下：

function postArticle()
{
/** Configure your account */
var username = 'myname';
var postingWif = 'mykey';

/** Broadcast a post */
var permlink = new Date().toISOString().replace(/[^a-zA-Z0-9]+/g, '').toLowerCase();

steem.broadcast.comment(
postingWif,
'', // Leave parent author empty
'photography', // Main tag
username, // Author
permlink + '-post', // Permlink
'This is just a test!', // Title
'Nothing to see here', // Body
{ tags: ['test'], app: 'steemjs/examples' }, // Json Metadata
function (err, result) {
if (err)
alert('Failure! ' + err);
else
alert('Success!');
}
);
}

有steemit朋友这样用过吗？有没有出现类似的问题？是我哪里弄错了吗？