title: org.testng.TestNGException: while trying to execute the tests
body: <p>I have been working on a project using Android Studio since long. Today refactored some code and it started to break,so reverted the changes. Even after reverting the changes whenever I try to debug the code, I am ending up with following an exception : </p>
  
  <pre><code>org.testng.TestNGException: org.xml.sax.SAXParseException; lineNumber: 3; columnNumber: 44; Attribute "parallel" with value "none" must have a value from the list "false methods tests classes instances ".
      at org.testng.TestNG.initializeSuitesAndJarFile(TestNG.java:325)
      at org.testng.remote.RemoteTestNG.run(RemoteTestNG.java:90)
      at org.testng.remote.RemoteTestNG.initAndRun(RemoteTestNG.java:206)
      at org.testng.remote.RemoteTestNG.main(RemoteTestNG.java:177)
      at org.testng.RemoteTestNGStarter.main(RemoteTestNGStarter.java:125)
  Caused by: org.xml.sax.SAXParseException; lineNumber: 3; columnNumber: 44; Attribute "parallel" with value "none" must have a value from the list "false methods tests classes instances ".
      at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(ErrorHandlerWrapper.java:203)
      at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.error(ErrorHandlerWrapper.java:134)
      at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:396)
      at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:327)
      at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:284)
      at com.sun.org.apache.xerces.internal.impl.dtd.XMLDTDValidator.validateDTDattribute(XMLDTDValidator.java:1392)
      at com.sun.org.apache.xerces.internal.impl.dtd.XMLDTDValidator.addDTDDefaultAttrsAndValidate(XMLDTDValidator.java:1311)
      at com.sun.org.apache.xerces.internal.impl.dtd.XMLDTDValidator.handleStartElement(XMLDTDValidator.java:1917)
      at com.sun.org.apache.xerces.internal.impl.dtd.XMLDTDValidator.startElement(XMLDTDValidator.java:742)
      at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.scanStartElement(XMLNSDocumentScannerImpl.java:380)
      at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl$NSContentDriver.scanRootElementHook(XMLNSDocumentScannerImpl.java:614)
      at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:3135)
      at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$PrologDriver.next(XMLDocumentScannerImpl.java:880)
      at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:606)
      at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(XMLNSDocumentScannerImpl.java:118)
      at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:510)
      at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:848)
      at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:777)
      at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:141)
      at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1213)
      at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:643)
      at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl.parse(SAXParserImpl.java:327)
      at javax.xml.parsers.SAXParser.parse(SAXParser.java:195)
      at org.testng.xml.XMLParser.parse(XMLParser.java:39)
      at org.testng.xml.SuiteXmlParser.parse(SuiteXmlParser.java:16)
      at org.testng.xml.SuiteXmlParser.parse(SuiteXmlParser.java:9)
      at org.testng.xml.Parser.parse(Parser.java:172)
      at org.testng.TestNG.initializeSuitesAndJarFile(TestNG.java:305)
      ... 4 more
  </code></pre>
  
  <p>trying to open the project using <code>intelliJ</code> I can get this gone. Any clues on this??</p>