Ask for HELP:XI Adapter Engine Cache Failed!

Hello!

I come across such weird problem as follows:

When I try to create a communication channel for a Service in Integration Directory, I can not find any objects of Adapter Types.

Then I went to Runtime Workbench->Component Monitoring and press the Cache Connectivity Test and get such error in Adapter Engine Option:

"

Attempt to fetch cache data from Integration Directory failed; cache could not be updated

[Fetch Data]: Unable to find an associated SLD element (source element: SAP_XIIntegrationServer, [CreationClassName, SAP_XIIntegrationServer, string, Name, is.01.sap-srm-dev, string], target element type: SAP_BusinessSystem)

"

I've tried everything I can but in vain.

Thanks for any clew!

Message was edited by:

Kee Wang