Mozilla web service implementation, problem with wsdl:type

The WSDL cannot be parsed when in my <wsdl:types> section of my web service
(provided by GLUE) this exception type is introduced ...

<wsdl:definitions xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/";
xmlns:xsd="http://www.w3.org/2001/XMLSchema";
xmlns:n4="http://www.webmethods.com/exceptions/";
xmlns:n5="http://www.webmethods.com/package/de.rochade.srap/";
xmlns:n6="http://www.webmethods.com/package/java.lang/";
xmlns:tns="rochade:de.rochade.srap.RoSOAPSimpleService"
xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/";
xmlns:tme="http://www.webmethods.com/";
targetNamespace="rochade:de.rochade.srap.RoSOAPSimpleService"
name="RoSOAPSimpleServiceImpl">
 <wsdl:types>
  <xsd:schema
targetNamespace="http://www.webmethods.com/package/de.rochade.srap/";>
   <xsd:import namespace="http://www.webmethods.com/exceptions/"/>
   <xsd:complexType name="SrapException">
    <xsd:complexContent>
     <xsd:extension base="n4:exception">
      <xsd:all>
       <xsd:element name="column_number" minOccurs="0" type="xsd:int"/>
       <xsd:element name="ex_code" minOccurs="0" nillable="true"
type="xsd:string"/>
       <xsd:element name="ex_domain" minOccurs="0" nillable="true"
type="xsd:string"/>
       <xsd:element name="ex_plain_message" minOccurs="0" nillable="true"
type="xsd:string"/>
       <xsd:element name="ex_subdomain" minOccurs="0" nillable="true"
type="xsd:string"/>
       <xsd:element name="line_number" minOccurs="0" type="xsd:int"/>
       <xsd:element name="line_source" minOccurs="0" nillable="true"
type="xsd:string"/>
       <xsd:element name="my_message" minOccurs="0" nillable="true"
type="xsd:string"/>
       <xsd:element name="orig_stacktrace" minOccurs="0" nillable="true"
type="xsd:string"/>
       <xsd:element name="source_name" minOccurs="0" nillable="true"
type="xsd:string"/>
       <xsd:element name="source_name_stack" minOccurs="0" nillable="true"
type="xsd:string"/>
       <xsd:element name="wrapped_stacktrace" minOccurs="0" nillable="true"
type="xsd:string"/>
      </xsd:all>
     </xsd:extension>
    </xsd:complexContent>
   </xsd:complexType>
  </xsd:schema>

Other ones, like
  <xsd:schema targetNamespace="http://www.webmethods.com/exceptions/";>
   <xsd:complexType name="exception">
    <xsd:complexContent>
     <xsd:extension base="n4:throwable"/>
    </xsd:complexContent>
   </xsd:complexType>
   <xsd:complexType name="throwable">
    <xsd:all>
     <xsd:element name="detailMessage" type="xsd:string" nillable="true"/>
     <xsd:element name="stackTrace" type="xsd:string" minOccurs="0"/>
     <xsd:element name="cause" type="n4:throwable" minOccurs="0"/>
    </xsd:all>
   </xsd:complexType>
  </xsd:schema>
do not prevent the WSDL from being parsed ...

Any idea what could be wrong with this exception type?
Thanx!
   Alfred