HTTP :unsupported content-encoding of '' found

I' receiving the error: Caused by: org.apache.axis2.AxisFault: HTTP 
:unsupported content-encoding of '' found
The SOAP call runs fine on the server, but on the client side this error 
appears.
How can I fix this? I could catch this exception and consider that the 
call is fine, but can I fix it in another way?

This is the whole stack trace:
Caused by: org.apache.axis2.AxisFault: HTTP :unsupported 
content-encoding of '' found
  at 
org.apache.axis2.transport.http.impl.httpclient3.HTTPSenderImpl.processResponse(HTTPSenderImpl.java:476)
  at 
org.apache.axis2.transport.http.impl.httpclient3.HTTPSenderImpl.handleResponse(HTTPSenderImpl.java:311)
  at 
org.apache.axis2.transport.http.impl.httpclient3.HTTPSenderImpl.sendViaPost(HTTPSenderImpl.java:213)
  at org.apache.axis2.transport.http.HTTPSender.send(HTTPSender.java:121)
  at 
org.apache.axis2.transport.http.CommonsHTTPTransportSender.writeMessageWithCommons(CommonsHTTPTransportSender.java:403)
  at 
org.apache.axis2.transport.http.CommonsHTTPTransportSender.invoke(CommonsHTTPTransportSender.java:234)
  at org.apache.axis2.engine.AxisEngine.send(AxisEngine.java:431)
  at 
org.apache.axis2.description.OutInAxisOperationClient.send(OutInAxisOperation.java:399)
  at 
org.apache.axis2.description.OutInAxisOperationClient.executeImpl(OutInAxisOperation.java:225)
  at 
org.apache.axis2.client.OperationClient.execute(OperationClient.java:150)
  at 
stubs.StoreClinicalDocument.client.StoreClinicalDocumentStub.storeClinicalDocumentS(StoreClinicalDocumentStub.java:377)

In StoreClinicalDocumentStub.java, at the line 377 I have: 
"_operationClient.execute(true);"

Thank you.