FritzBoxT064 Binding UPnPError Code: 713

Hello,
I recently installed the FritzBox TR064 Binding. Most of the things seem to work but I get Warnings all over the place in the logs. See for yourselfs:

2019-03-12 22:04:12.806 [WARN ] [itzboxtr064.internal.SoapValueParser] - Fault received from FritzBox for item :0 in SOAP response <?xml version=“1.0”?><s:Envelope xmlns:s=“http://schemas.xmlsoap.org/soap/envelope/” s:encodingStyle=“http://schemas.xmlsoap.org/soap/encoding/”>

<s:Body>

<s:Fault>

<faultcode>s:Client</faultcode>

<faultstring>UPnPError</faultstring>

<detail>

<UPnPError xmlns=“urn:dslforum-org:control-1-0”>

<errorCode>713</errorCode>

<errorDescription>SpecifiedArrayIndexInvalid</errorDescription>

</UPnPError>

</detail>

</s:Fault>

</s:Body>

</s:Envelope>

I searched for an answer here already. But unfortunately I could not find my error here.

Ohh and BTW UPnP is enabled see here:
image

I found the solution.

The problem seems to be that, when call deflection is disabled but you still have an Item like this one:

Switch  fboxCD0Switch    "Call Deflection ID 0"         (gfritzbox) {fritzboxtr064="callDeflectionSwitch:0"}