soap on windows os and apache webserver

I don't know if it is possible to use your SOAP package on a pc with a WindowsXP OS and Apache webserver. Please help! I get this error while trying the Client.php example: ------------------------------------------------------------------------ ------------------------------------------------------------------------ ----------------------------------- soap_fault Object ( [error_message_prefix] => [mode] => 1 [level] => 1024 [code] => Client [message] => [userinfo] => [backtrace] => Array ( [0] => Array ( [file] => c:\programmer\apache group\apache\htdocs\soap\Fault.php [line] => 49 [function] => pear_error [class] => pear_error [type] => :: [args] => Array ( [0] => [1] => Client [2] => [3] => [4] => ) ) [1] => Array ( [file] => c:\programmer\apache group\apache\htdocs\soap\Base.php [line] => 199 [function] => soap_fault [class] => soap_fault [type] => -> [args] => Array ( [0] => [1] => Client [2] => [3] => [4] => [5] => ) ) [2] => Array ( [file] => c:\programmer\apache group\apache\htdocs\soap\Client.php [line] => 257 [function] => _raisesoapfault [class] => soap_client [type] => -> [args] => Array ( [0] => ) ) [3] => Array ( [file] => c:\programmer\apache group\apache\htdocs\soap\example\client.php [line] => 35 [function] => call [class] => soap_client [type] => -> [args] => Array ( [0] => echoStringSimple [1] => Array ( [inputStringSimple] => this is a test string ) [2] => Array ( [namespace] => urn:SOAP_Example_Server [trace] => 1 ) ) ) ) [callback] => ) soap_fault Object ( [error_message_prefix] => [mode] => 1 [level] => 1024 [code] => Client [message] => [userinfo] => [backtrace] => Array ( [0] => Array ( [file] => c:\programmer\apache group\apache\htdocs\soap\Fault.php [line] => 49 [function] => pear_error [class] => pear_error [type] => :: [args] => Array ( [0] => [1] => Client [2] => [3] => [4] => ) ) [1] => Array ( [file] => c:\programmer\apache group\apache\htdocs\soap\Base.php [line] => 199 [function] => soap_fault [class] => soap_fault [type] => -> [args] => Array ( [0] => [1] => Client [2] => [3] => [4] => [5] => ) ) [2] => Array ( [file] => c:\programmer\apache group\apache\htdocs\soap\Client.php [line] => 257 [function] => _raisesoapfault [class] => soap_client [type] => -> [args] => Array ( [0] => ) ) [3] => Array ( [file] => c:\programmer\apache group\apache\htdocs\soap\example\client.php [line] => 41 [function] => call [class] => soap_client [type] => -> [args] => Array ( [0] => echoString [1] => Array ( [inputString] => this is a test string ) [2] => Array ( [namespace] => urn:SOAP_Example_Server [trace] => 1 ) ) ) ) [callback] => ) Error: Error: soap_fault Object ( [error_message_prefix] => [mode] => 1 [level] => 1024 [code] => Client [message] => [userinfo] => [backtrace] => Array ( [0] => Array ( [file] => c:\programmer\apache group\apache\htdocs\soap\Fault.php [line] => 49 [function] => pear_error [class] => pear_error [type] => :: [args] => Array ( [0] => [1] => Client [2] => [3] => [4] => ) ) [1] => Array ( [file] => c:\programmer\apache group\apache\htdocs\soap\Base.php [line] => 199 [function] => soap_fault [class] => soap_fault [type] => -> [args] => Array ( [0] => [1] => Client [2] => [3] => [4] => [5] => ) ) [2] => Array ( [file] => c:\programmer\apache group\apache\htdocs\soap\Client.php [line] => 257 [function] => _raisesoapfault [class] => soap_client [type] => -> [args] => Array ( [0] => ) ) [3] => Array ( [file] => c:\programmer\apache group\apache\htdocs\soap\example\client.php [line] => 78 [function] => call [class] => soap_client [type] => -> [args] => Array ( [0] => echoStruct [1] => Array ( [inputStruct] => soap_value Object ( [value] => Array ( [0] => soap_value Object ( [value] => test string [name] => varString [type] => string [namespace] => [type_namespace] => [attributes] => Array ( ) [arrayType] => [options] => Array ( ) [nqn] => qname Object ( [name] => varString [ns] => [namespace] => ) [tqn] => qname Object ( [name] => string [ns] => [namespace] => ) [type_prefix] => ) [1] => soap_value Object ( [value] => 123 [name] => varInt [type] => int [namespace] => [type_namespace] => [attributes] => Array ( ) [arrayType] => [options] => Array ( ) [nqn] => qname Object ( [name] => varInt [ns] => [namespace] => ) [tqn] => qname Object ( [name] => int [ns] => [namespace] => ) [type_prefix] => ) [2] => soap_value Object ( [value] => 123.123 [name] => varFloat [type] => float [namespace] => [type_namespace] => [attributes] => Array ( ) [arrayType] => [options] => Array ( ) [nqn] => qname Object ( [name] => varFloat [ns] => [namespace] => ) [tqn] => qname Object ( [name] => float [ns] => [namespace] => ) [type_prefix] => ) ) [name] => inputStruct [type] => SOAPStruct [namespace] => [type_namespace] => http://soapinterop.org/xsd [attributes] => Array ( ) [arrayType] => [options] => Array ( ) [nqn] => qname Object ( [name] => inputStruct [ns] => [namespace] => ) [tqn] => qname Object ( [name] => SOAPStruct [ns] => [namespace] => http://soapinterop.org/xsd ) [type_prefix] => ) ) [2] => Array ( [namespace] => urn:SOAP_Example_Server [trace] => 1 ) ) ) ) [callback] => ) Error: varString: varInt: varFloat: