Regarding SAML and SOA setup in EBS R12

I did SOA integration setup with EBS R12 and after that I am testing SAML. But while testing SAML per document 1144313.1, I am receiving the following error in response window of soaUI.

 

<env:Envelope xmlns:env="http://schemas.xmlsoap.org/soap/envelope/">
<env:Header/>
<env:Body>
<env:Fault>
<faultcode>env:Server</faultcode>
<faultstring>Internal Server Error</faultstring>
<faultactor/>
</env:Fault>
</env:Body>
</env:Envelope>

 

Any suggestion over how to debug will be high appreciated.