Why does SoapClient crash?

Question

SOAP

Why am I getting this error?

SoapFault exception: [HTTP] in /var/www/newprod.direct-credit.ru/www/local/modules/dc/bankapi/otp.php:2194
Stack trace:
#0 [internal function]: SoapClient->__doRequest( '__call('CreateOpty_spcv...', Array)
#2 /var/www/newprod.direct-credit.ru/www/local/modules/dc/bankapi/otp.php(2194): SoapClient->CreateOpty_spcv2(Array )
#3 /var/www/newprod.direct-credit.ru/www/local/modules/dc/bankapi/otp.php(302): DC\Otp->send_soap_request('CreateOpty_spcv...', Array, ' CreateOpty_spcv...')
#4 /var/www/newprod.direct-credit.ru/www/localtest/kz/test.php(97): DC\Otp->create()
#5 {main}