有两个用户jehord和jenkins 从命令控制台运行测试生成了nightwatch 如果从用户jehord开始，那么一切都很好，但如果切换并运行来自用户jenkins的测试我得到一个错误
> Error retrieving a new session from the selenium server { sessionId:
> null, status: 13, state: 'unhandled error', value: {
> supportUrl: null,
> screen: null,
> additionalInformation: '\nDriver info: org.openqa.selenium.chrome.ChromeDriver',
> hCode: 1457029,
> buildInformation:
> { releaseLabel: '2.45.0',
> buildTime: '2015-02-26 23:59:50',
> class: 'org.openqa.selenium.internal.BuildInfo',
> buildRevision: '5017cb8',
> hCode: 13974215 },
> systemInformation: 'System info: host: \'jehord-VirtualBox\', ip: \'127.0.1.1\', os.name: \'Linux\', os.arch: \'i386\', os.version:
> \'3.13.0-32-generic\', java.version: \'1.7.0_79\'',
> class: 'org.openqa.selenium.WebDriverException',
> cause: null,
> localizedMessage: 'unknown error: Chrome failed to start: exited abnormally\n (Driver info: chromedriver=2.9.248316,platform=Linux
> 3.13.0-32-generic x86) (WARNING: The server did not provide any stacktrace information)\nCommand duration or timeout: 60.62
> seconds\nBuild info: version: \'2.45.0\', revision: \'5017cb8\', time:
> \'2015-02-26 23:59:50\'\nSystem info: host: \'jehord-VirtualBox\', ip:
> \'127.0.1.1\', os.name: \'Linux\', os.arch: \'i386\', os.version:
> \'3.13.0-32-generic\', java.version: \'1.7.0_79\'\nDriver info:
> org.openqa.selenium.chrome.ChromeDriver',
> message: 'unknown error: Chrome failed to start: exited abnormally\n (Driver info: chromedriver=2.9.248316,platform=Linux
> 3.13.0-32-generic x86) (WARNING: The server did not provide any stacktrace information)\nCommand duration or timeout: 60.62
> seconds\nBuild info: version: \'2.45.0\', revision: \'5017cb8\', time:
> \'2015-02-26 23:59:50\'\nSystem info: host: \'jehord-VirtualBox\', ip:
> \'127.0.1.1\', os.name: \'Linux\', os.arch: \'i386\', os.version:
> \'3.13.0-32-generic\', java.version: \'1.7.0_79\'\nDriver info:
> org.openqa.selenium.chrome.ChromeDriver',
> suppressed: [ [length]: 0 ] }, class: 'org.openqa.selenium.remote.Response', hCode: 24277937 }
>
> Connection refused! Is selenium server started?
有什么问题？