i wrote a standlone java client that uses Jco to connect to SAP . it worked fine till recently.But now its giving a
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. <b>Found version "620.0.1844" but required at least version "640.0.76"</b>.
Exception in thread "main" .
i can see that its some version confilct but how did it work till now. i didnt change any of the two dll's or the sapjar jar file