Error on using bc.sf.framework_api.jar for accessing the KM content

Hi ,

Im trying to access the KM content from wdj application im using jar file

but im getting error like

[javac] ERROR: bad class file: E:\sap_ep_prog\dc\.dtc\0\DCs\*******\portal_dev\kmjar\_comp\gen\default\public\Compilation_kmjar_pp\lib\java\bc.sf.framework_api.jar(com/sapportals/wcm/service/IServiceTypesConst.class)

[javac] ERROR: class file has wrong version 49.0, should be 48.0

[javac] ERROR: Please remove or make sure it appears in the correct subdirectory of the classpath.

[javac] ERROR: import com.sapportals.wcm.service.IServiceTypesConst;

[javac] ERROR: ^

[javac] 1 error

Regards

Govardan Raj