CasperJS不适用于Centos Server,但适用于Windows 10[重复]

这段代码是我在桌面上写的,在Windows 10下运行,一切正常。当我转到Centos服务器时,我开始出错。请帮帮我

CasperError: Cannot get informations from input[name="email"]: element not found.
  /home/casper/casperjs/phantomjs:/platform/casper.js:1158 in getElementInfo
  /home/casper/casperjs/phantomjs:/platform/casper.js:1721 in sendKeys
  /home/casper/casperjs/phantomjs:/code/cars.js:9
  /home/casper/casperjs/phantomjs:/platform/casper.js:1685 in runStep
  /home/casper/casperjs/phantomjs:/platform/casper.js:414 in checkStep

var casper = require('casper').create();

casper
    .start('https://example.com', function() {
    this.echo(this.getTitle());
    this.click("span.btn.btn-green");
    }).wait(5000).then(function () {
	    this.capture('sdsdsd.png');
        this.sendKeys('input[name="email"]', 'name');
        this.sendKeys('input[name="password"]', 'pass');
        this.click("button.btn.btn-h40.btn-green.btn-fw.btn-submit");
        console.log("Auth");

    })
casper.run();