500 Internal Server Error

Hi,

I have upgraded my Local server to SP13 to SP19 but i am facing some problems.

I am successfully able to login via visual admin.

If i enter this in url http://localhost:50000/irj/portal i am getting following error messages.

500 Internal Server Error SAP J2EE Engine/6.40

Application error occurred during request processing.

Details: java.lang.AbstractMethodError: com.sap.portal.navigation.AliasService.getPrefix(Ljava/lang/String;Ljava/lang/StringBuffer;)Ljava/lang/String;

Exception id: [001641A82FBC006200000006000008F400042FDB4446AA3D]

Kindly help me out in this issue.