SRVE0068E: Uncaught exception thrown in one of the service methods of the servlet

Here's an error message i am getting.
I am using Java RAD
00000023 ServletWrappe E SRVE0068E: Uncaught exception thrown in one of the service methods of the servlet: Login. Exception thrown : java.lang.NoClassDefFoundError: com.ibm.db2.jcc.c.yh


at com.ibm.db2.jcc.a.a.a(a.java:366)
at com.ibm.db2.jcc.a.a.a(a.java:366)
at com.ibm.db2.jcc.a.a.A(a.java:335)
at com.ibm.db2.jcc.a.a.A(a.java:335)
at com.ibm.db2.jcc.a.a.n(a.java:293)
at com.ibm.db2.jcc.a.a.n(a.java:293)
at com.ibm.db2.jcc.c.p.c(p.java:280)
at com.ibm.db2.jcc.c.p.c(p.java:280)
at com.ibm.db2.jcc.c.qh.a(qh.java:1873)
at com.ibm.db2.jcc.c.qh.a(qh.java:1873)
at com.ibm.db2.jcc.c.qh.c(qh.java:522)
at com.ibm.db2.jcc.c.qh.c(qh.java:522)
at com.ibm.db2.jcc.c.qh.executeUpdate(qh.java:506)
at com.ibm.db2.jcc.c.qh.executeUpdate(qh.java:506)
at com.ibm.ws.rsadapter.jdbc.WSJdbcStatement.executeU pdate(WSJdbcStatement.java:834)
at com.ibm.ws.rsadapter.jdbc.WSJdbcStatement.executeU pdate(WSJdbcStatement.java:834)
at classes.Database.setDbSchema(Database.java:180)
at classes.Database.setDbSchema(Database.java:180)
at classes.Database.fetch(Database.java:73)
at classes.Database.fetch(Database.java:73)
at classes.Model.fetch(Model.java:79)
at classes.Model.fetch(Model.java:79)
at classes.Model.fetchOne(Model.java:36)
at classes.Model.fetchOne(Model.java:36)
at servlets.Login.post(Login.java:53)
at servlets.Login.post(Login.java:53)
at classes.Controller.doPost(Controller.java:31)
at classes.Controller.doPost(Controller.java:31)
at javax.servlet.http.HttpServlet.service(HttpServlet .java:763)
at javax.servlet.http.HttpServlet.service(HttpServlet .java:763)
at javax.servlet.http.HttpServlet.service(HttpServlet .java:856)
at javax.servlet.http.HttpServlet.service(HttpServlet .java:856)
..............................

Any idea why i am getting this error and please help me resolve this error.

Thanks and any help will be appreciated.