migrating custom Webdyn pro java apps 7.0 to 7.4

Hi experts,

As we are migrating portal from 7.0 to 7.4,

we are facing issue

1. java.lang.ClassNotFoundException: com.sap.pcuigp.xssutils.interfaces.wdp.IExternalIXssAppConf ------------------------- Loader Info ------------------------- ClassLoader name: [sap.com/hr_nom] Loader hash code: 1b743756 Living status: alive Direct parent loaders: [system:Frame] [interface:webservices] [interface:cross] [interface:security] [interface:transactionext] [library:webservices_lib] [library:opensql] [library:jms] [library:ejb20] [service:p4] [service:ejb] [service:servlet_jsp] [library:tc~cmi] [library:tc~aii~base~offline~facade] [library:tc~bl~exception~lib] [sap.com/tc~wd~api] [library:tc~bl~logging~api] Resources: /usr/sap/ES2/J01/j2ee/cluster/apps/sap.com/hr_nom/servlet_jsp/webdynpro/resources/sap.com/hr_nom/root/WEB-INF/lib/sap.com~hr_nom.jar

we add pcui_gp as dependecy to dc.. Build succcessfully, deploy successfully,

when we go for preview , we are getting error

Please help