plus.webview.create http://www.baidu.com报错

var subpage_style = {
top: '46px',
bottom: '50px'
};

plus.webview.create('http://www.baidu.com','baidu',subpage_style);

这是什么原因造成的错误

[ERROR] : TypeError: undefined is not a function
filename:undefined
lineno:0
[ERROR] : TypeError: undefined is not an object (evaluating 'B.kts.push')
filename:http://www.baidu.com/
lineno:2