Can not call web service created by workbench ES

I created a process in LiveCycle ES Workbench, a webservice is created automatically after activate this process.

I can see my wsdl on this path below.
http://myserver:port/soap/services/my_process?wsdl

After that, I created form in designer 8.1 then I call my web service.
but appear "Error attempting to read from file"

Please help me to solve this error.

Thank you.
Phatthalaphon.