SOAP + Config-Package (XML-Container) -> Fatal Error

Hello, a few hours ago, I've requested help for SOAP and SOAP_Fault. Now, after do some search in my code, I've found the reason, why my SOAP_Fault fails and produces an Fatal Error: I use PEAR::SOAP and PEAR::Config in one application. I read configuration values from an xml-file, using the XML_Container of PEAR::Config. And there the error occurs. When using an other Container, like phparray, this error didn't occured and SOAP_Fault reacted normally. Is there another developer, who can confirm this error? Greetings Christian Michel