CodeIgniter PHP SOAP

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I have a project that provides a search service with the SOAP extension to PHP, the results are in an array when data grow to at least 60 more results occurs the following error, "Fatal error: Uncaught SoapFault exception: [Client] looks like we got no XML document in / var/www/PhpProject2/cliente.php: 17 Stack trace: # 0 [internal function]: SoapClient-> __call ('busqueda_avanza ...', Array) # 1 / var/www/PhpProject2 / cliente.php (17): SoapClient-> busqueda_avanzada (Array) # 2 (main) Thrown in / var/www/PhpProject2/cliente.php on line 17 ". When I use the same services out of CI project no problems, everythongs OK, please to everybady y you known what is happenig contact-to: CI_Important