title: Attribute "parallel" with value "none" must have a value from the list "false methods tests classes instances "
body: <p>I have created maven project using selenium webdriver in these I have integrate the testng, but when I validate my maven project it displayed <strong>"Attribute "parallel" with value "none" must have a value from the list "false methods tests classes instances"</strong> in <code>testng-failed.xml</code> and in <code>testng.xml</code>.</p>
  
  <p>Can anyone please help me to resolved this problem.</p>
  
  <p><strong>testng-failed.xml</strong></p>
  
  <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt;
  &lt;!DOCTYPE suite SYSTEM "http://testng.org/testng-1.0.dtd"&gt;
  &lt;suite name="Failed suite [Gmail]" parallel="none"&gt;
    &lt;test name="GmailLoginTest(failed)" parallel="none"&gt;
      &lt;classes&gt;
        &lt;class name="gmailTestcc.LoginTest"&gt;
          &lt;methods&gt;
            &lt;include name="setUp"/&gt;
            &lt;include name="mainAndGmailDashboardTest"/&gt;
          &lt;/methods&gt;
        &lt;/class&gt; &lt;!-- gmailTestcc.LoginTest --&gt;
      &lt;/classes&gt;
    &lt;/test&gt; &lt;!-- GmailLoginTest(failed) --&gt;
  &lt;/suite&gt; &lt;!-- Failed suite [Gmail] --&gt;
  </code></pre>
  
  <p><strong>testng.xml</strong></p>
  
  <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt;
  &lt;!DOCTYPE suite SYSTEM "http://testng.org/testng-1.0.dtd"&gt;
  &lt;suite name="Gmail" parallel="none"&gt;
    &lt;test name="GmailLoginTest"&gt;
      &lt;classes&gt;
        &lt;class name="gmailTestcc.LoginTest"/&gt;
      &lt;/classes&gt;
    &lt;/test&gt; &lt;!-- GmailLoginTest --&gt;
  &lt;/suite&gt; &lt;!-- Gmail --&gt;
  </code></pre>