Problems with Synchronous Java Proxy

Hi All.

I have a scenarium composed by a syncronous interface with a sender ABAP Proxy and a receiver Java Proxy.

When I try to execute it, I got the following error:

"SAP XI Java Proxy Runtime: Error getting JPR configuration from SLD. Exception: No entity of class SAP_J2EEEngineCluster for prt.Java.null found Please check availability of System Landscape Directory on XI Integration Server. See also trace file in log destination library_com.sap.aii.proxy.xiruntime_JPRTrace."

I have already created a Business system in SLD pointing to the "Web as Java" technical system created when the integration engine was installed.

What can be wrong?

Any help will be welcome.

Thank you.