title: Failed to load external entity
body: <p>I am trying to integrate fedex API and getting this error .</p>
  <blockquote>
  <p>Warning: SoapClient::SoapClient() [soapclient.soapclient]: I/O warning : failed to load external entity &quot;../wsdl/RateService_v13.wsdl&quot; in test.php on line 12</p>
  <p>Fatal error: Uncaught SoapFault exception: [WSDL] SOAP-ERROR: Parsing WSDL: Couldn't load from '../wsdl/RateService_v13.wsdl' in D:\wamp\www\fedexapi\AddressValidationService_v4_php\php\AddressValidationWebServiceClient\rate_test.php:12 Stack trace: #0 D:\wamp\www\fedexapi\AddressValidationService_v4_php\php\AddressValidationWebServiceClient\rate_test.php(12): SoapClient-&gt;SoapClient('../wsdl/RateSer...', Array) #1 {main} thrown in test.php on line 12</p>
  </blockquote>
  <pre><code>&lt;?php
  // Copyright 2009, FedEx Corporation. All rights reserved.
  // Version 2.0.0
  
  require_once('../library/fedex-common.php5');
  
  //The WSDL is not included with the sample code.
  //Please include and reference in $path_to_wsdl variable.
  $path_to_wsdl = &quot;../wsdl/LocationsService_v3.wsdl&quot;;
  
  ini_set(&quot;soap.wsdl_cache_enabled&quot;, &quot;0&quot;);
  
  $client = new SoapClient($path_to_wsdl, array('trace' =&gt; 1)); // Refer to http://us3.php.net/manual/en/ref.soap.php for more information
  
  $request['WebAuthenticationDetail'] = array(
          'ParentCredential' =&gt; array(
              'Key' =&gt; getProperty('parentkey'),
              'Password' =&gt; getProperty('parentpassword')
          ),
          'UserCredential' =&gt; array(
              'Key' =&gt; getProperty('key'), 
              'Password' =&gt; getProperty('password')
      )
  );
  
  ?&gt;
  </code></pre>
  <p>How to solve this ?</p>