Received the following error when deleting thread bookmark

OracleJSP: oracle.jsp.provider.JspCompileException:
Errors compiling:/home/NEWTSS/software/oc4j/j2ee/home/application-deployments/portal/portal-web/persistence/_pages/_user/_components/_deletebookmarks.java
Line # Error
45
 [jsp src:line #:2]
Class _user._components.Enumeration not found. Enumeration names = request.getParameterNames();