While searching KM content getting error

Hi experts,

                 I am having SAP EP 7.3 SP11.While searching in KM content, I am getting this exception :-

Cannot process an HTTP request to servlet [prt] in [irj] web application.

[EXCEPTION]

java.lang.NoSuchMethodError: com.sapportals.portal.prt.service.laf.ILAFService.getRelativeImageURL

(Lcom/sapportals/portal/prt/component/IPortalComponentRequest;Lcom/sapportals/portal/prt/service/laf/Th

emeType;Ljava/lang/String;)Ljava/lang/String;

at com.sapportals.wcm.control.util.ImageRendererUtil.getCurrentThemeUrl(ImageRendererUtil.java:600)

          This error occurs even when I am creating KM search iview.

          I would appreciate your help on this