Webservices / SOAMANGER: WSDL isn't generated - parsing error EOF

Hello,

since some weeks the WSDL files of my webservices aren't working anymore.

If I call an WSDL-URL directly or by clicking through the SOAMANAGER Webservice configuration, I get this error message:

<?xml version="1.0"?>

<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">

    <soap:Body>

        <soap:Fault>

            <faultcode>soap:Server</faultcode>

            <faultstring>Error: SXML reader/writer exception</faultstring>

            <detail xmlns:slibfault="http://xml.sap.com/2005/11/esi/slib/fault/">

                <slibfault:timestamp>Wed, 22 Jun 2016 06:20:34 GMT</slibfault:timestamp>

                <slibfault:exception>

                    <slibfault:text>Error while parsing an XML stream: '<EOF> reached'.</slibfault:text>

                        <slibfault:position line="3 " include="CL_SXML_READER================CM00B" program="CL_SXML_READER================CP"/>

                    </slibfault:exception>

                </detail>

            </soap:Fault>

        </soap:Body>

    </soap:Envelope>

The webservices themselves are working fine, but I cannot connect new consumers which need to read out the webservice description.

Does anybody have an idea how to resolve this issue?