JCO-RFC Error

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Hi,

I've installed a standalone NW WAS Java Stack SP18(without ABAP stack) and intend to connect to SAP R/3. But when i tried to set the JCO-RFC Provider in Visual Admin, error occured as below:

java.lang.ExceptionInInitializerError: JCO.classInitialize(): Could not load middleware layer 'com.sap.mw.jco.rfc.MiddlewareRFC'

JCO.nativeInit(): Could not initialize dynamic link library librfc. Found version "640.0.73" but required at least version "640.0.76". occurred while service dsr processed containerStarted() event JCO.classInitialize(): Could not load middleware layer 'com.sap.mw.jco.rfc.MiddlewareRFC'

JCO.nativeInit(): Could not initialize dynamic link library librfc. Found version "640.0.73" but required at least version "640.0.76".

Any idea?