Annoying ZK Spring Security Eclipse Warnings

Referenced bean 'zkDesktopReuseFilter' not found [config set: ****/web-context]	spring-security.xml	line 30	Spring Beans Problem

    <http auto-config="true" use-expressions="false"  >
...       
	<custom-filter ref="zkDesktopReuseFilter" position="FIRST" />
	    <custom-filter ref="zkDisableSessionInvalidateFilter" before="FORM_LOGIN_FILTER" />
	    <custom-filter ref="zkEnableSessionInvalidateFilter" before="FILTER_SECURITY_INTERCEPTOR"/>
	    <custom-filter ref="zkLoginOKFilter" after="FILTER_SECURITY_INTERCEPTOR"/>
	    <custom-filter ref="zkError403Filter" after="LOGOUT_FILTER"/>
    </http>