我目前在selenium webdriver上使用Webdriver.io来为我的reactjs前端编写测试。使用默认的点错误报告器正确运行测试。当我使用诱惑记者（http://webdriver.io/guide/reporters/allure.html）时，会创建json文件。但是，当我尝试生成HTML报告时，我收到NumberFormatException错误。显示完整错误：
Exception in thread "main" java.lang.NumberFormatException: For input string: ""
at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
at java.lang.Long.parseLong(Long.java:453)
at java.lang.Long.valueOf(Long.java:540)
at com.sun.xml.internal.bind.DatatypeConverterImpl._parseLong(DatatypeConverterImpl.java:114)
at ru.yandex.qatools.allure.model.Step_JaxbXducedAccessor_stop.parse(TransducedAccessor_field_Long.java:48)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.StructureLoader.startElement(StructureLoader.java:194)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallingContext._startElement(UnmarshallingContext.java:537)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallingContext.startElement(UnmarshallingContext.java:516)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.SAXConnector.startElement(SAXConnector.java:125)
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.startElement(AbstractSAXParser.java:509)
at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.scanStartElement(XMLNSDocumentScannerImpl.java:380)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:2787)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:606)
at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(XMLNSDocumentScannerImpl.java:118)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:510)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:848)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:777)
at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:141)
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1213)
at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:642)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallerImpl.unmarshal0(UnmarshallerImpl.java:203)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallerImpl.unmarshal(UnmarshallerImpl.java:181)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallerImpl.unmarshal(UnmarshallerImpl.java:235)
at javax.xml.bind.JAXB.unmarshal(JAXB.java:242)
at ru.yandex.qatools.allure.commons.AllureFileUtils.unmarshal(AllureFileUtils.java:59)
at ru.yandex.qatools.allure.commons.AllureFileUtils.unmarshal(AllureFileUtils.java:50)
at ru.yandex.qatools.allure.commons.AllureFileUtils.unmarshal(AllureFileUtils.java:40)
at ru.yandex.qatools.allure.data.io.TestSuiteReader$TestSuiteResultIterator.next(TestSuiteReader.java:48)
at ru.yandex.qatools.allure.data.io.TestSuiteReader$TestSuiteResultIterator.next(TestSuiteReader.java:1)
at ru.yandex.qatools.allure.data.io.TestCaseReader$TestCaseResultIterator.nextSuite(TestCaseReader.java:46)
at ru.yandex.qatools.allure.data.io.TestCaseReader$TestCaseResultIterator.hasNext(TestCaseReader.java:56)
at ru.yandex.qatools.allure.data.AllureReportGenerator.generate(AllureReportGenerator.java:57)
at ru.yandex.qatools.allure.data.AllureReportGenerator.generate(AllureReportGenerator.java:53)
at ru.yandex.qatools.allure.AllureMain.main(AllureMain.java:48)
Command aborted due to exception {}.
org.apache.commons.exec.ExecuteException: Process exited with an error: 1 (Exit value: 1)
at org.apache.commons.exec.DefaultExecutor.executeInternal(DefaultExecutor.java:404)
at org.apache.commons.exec.DefaultExecutor.execute(DefaultExecutor.java:166)
at org.apache.commons.exec.DefaultExecutor.execute(DefaultExecutor.java:153)
at ru.yandex.qatools.allure.command.ReportGenerate.runUnsafe(ReportGenerate.java:48)
at ru.yandex.qatools.allure.command.AbstractCommand.run(AbstractCommand.java:52)
at ru.yandex.qatools.allure.CommandLine.main(CommandLine.java:46)
出现此错误的原因是什么？需要帮助。