Twilio schema validation warning
<p>I am receiving <a href="https://www.twilio.com/docs/api/errors/12200" rel="nofollow">schema validation warning</a> </p>

<blockquote>
  <p>Warning - 12200</p>
  
  <p>Schema validation warning</p>
  
  <p>The provided XML does not conform to the Twilio Markup XML schema.
  Please refer to the specific error and correct the problem. Possible
  Causes</p>
  
  <p>misspelled verbs incorrect case for verbs misspelled or unknown
  attributes unknown or unexpected nested elements. Possible Solutions</p>
  
  <p>check the line and column reported by the warning to see what part of
  your XML response caused the complaint</p>
</blockquote>

<p>with following </p>

<pre><code>&lt;?xml version="1.0" encoding="UTF-8" ?&gt;
&lt;Response&gt;
  &lt;Gather numDigits="1" action="/employee/set_job_type"&gt;
    &lt;Say voice="alice" language="en-US"&gt;press&lt;/Say&gt;
    &lt;Say voice="alice" language="en-US"&gt;1 for CREW.&lt;/Say&gt;
    &lt;Pause length="0.3" /&gt;
    &lt;Say voice="alice" language="en-US"&gt;2 for PORTER-MAID.&lt;/Say&gt;
    &lt;Pause length="0.3" /&gt;
    &lt;Say voice="alice" language="en-US"&gt;3 for PROJECT WORK.&lt;/Say&gt;
    &lt;Pause length="0.3" /&gt;
    &lt;Pause length="5" /&gt;
    &lt;Say voice="alice" language="en-US"&gt;press&lt;/Say&gt;
    &lt;Say voice="alice" language="en-US"&gt;4 for CREW.&lt;/Say&gt;
    &lt;Pause length="0.3" /&gt;
    &lt;Say voice="alice" language="en-US"&gt;5 for PORTER-MAID.&lt;/Say&gt;
    &lt;Pause length="0.3" /&gt;
    &lt;Say voice="alice" language="en-US"&gt;6 for PROJECT WORK.&lt;/Say&gt;
    &lt;Pause length="0.3" /&gt;
    &lt;Pause length="5" /&gt;
    &lt;Say voice="alice" language="en-US"&gt;press&lt;/Say&gt;
    &lt;Say voice="alice" language="en-US"&gt;7 for CREW.&lt;/Say&gt;
    &lt;Pause length="0.3" /&gt;
    &lt;Say voice="alice" language="en-US"&gt;8 for PORTER-MAID.&lt;/Say&gt;
    &lt;Pause length="0.3" /&gt;
    &lt;Say voice="alice" language="en-US"&gt;9 for PROJECT WORK.&lt;/Say&gt;
    &lt;Pause length="0.3" /&gt;
    &lt;Pause length="5" /&gt;
  &lt;/Gather&gt;
&lt;/Response&gt;
</code></pre>

<p>I can't find spelling mistake or invalid nesting. Only thing I can think of is back to back pause verb usage. However I don't see docs mentioning anything against it. </p>