How check vxml has error?

<?xml version="1.0" encoding="iso-8859-1" standalone="no"?>
<!-- DOCTYPE vxml SYSTEM "http://127.0.0.1:5000/voicexml1-0.dtd" -->
<vxml xmlns="http://www.w3.org/2001/vxml" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="2.0">

  <form id="dtmfForm">
      <property name="inputmodes" value="dtmf"/>
      <field name="dtmf">
        <audio src="http://localhost/File/voicefiles/T/menu/playCatDefinition.wav"/>

    <prompt>press 1</prompt>
        <audio src="http://localhost/File/voicefiles/T/cats/Love.wav"/>

    <prompt>press 2</prompt>
        <audio src="http://localhost/File/voicefiles/T/cats/Thinking of you.wav"/>

    <prompt>press 3</prompt>
        <audio src="http://localhost/File/voicefiles/T/cats/Oba Nathi Da.wav"/>

    <prompt>press 4</prompt>
        <audio src="http://localhost/File/voicefiles/T/cats/Adareta Kiyana Katha.wav"/>

    <prompt>press 5</prompt>
        <audio src="http://localhost/File/voicefiles/T/cats/Akamatththa.wav"/>

    <prompt>press 6</prompt>
        <audio src="http://localhost/File/voicefiles/T/cats/Sorry.wav"/>

    <prompt>press 7</prompt>
        <audio src="http://localhost/File/voicefiles/T/cats/Birthday.wav"/>

    <prompt>press 8</prompt>
        <audio src="http://localhost/File/voicefiles/T/cats/Annivesary.wav"/>

    <prompt>
        go to next step press 0 
    </prompt>

        <grammar mode="dtmf" root="digit">
          <rule id="digit" scope="public"> 
            <one-of>
                <item>0</item>
                <item>1</item>
                <item>2</item>
                <item>3</item>
                <item>4</item>
                <item>5</item>
                <item>6</item>
                <item>7</item>
                <item>8</item>
                <item>9</item>
            </one-of>
          </rule>
        </grammar>

    <if cond="dtmf=='9'">
        <goto next="http://localhost/myApp/resteasy/service/msisdn/7777?greetingCatagory='dtmf'"/>
    <else />
        <goto next="http://localhost/myApp/resteasy/service/msisdn/7777?greeting='dtmf'"/>
    </if>
      </field>      
    </form>
    <nomatch>
        No Match! I'm sorry, I didn't understand you.  Could you please try that again? 
        <reprompt />
    </nomatch>
    <noinput>
        No Input! I'm sorry, I didn't hear anything.  Could you please try that again? 
        <reprompt />
    </noinput>
</vxml>

Consider this vxml any error in this how to check vxml have error. How to, I Solve it? what kind error include in this vxml some time go to <goto next={url}/> this step other code not working .what is the error in this code? how to mange time next step go to.. I am looking for suitable answer?

Thanks.

<goto> element can't be inside <field>, that is responsible for collecting information from the user. It should be moved to <filled> responsible for it's interpretation. Structure is the following:

<form>
  <field>
    <grammar>...</grammar>
  </field>
  <filled>
     <goto ...
  </filled>
</form>

Voxeo documentation - filled element