JSP Processing Error

HTTP Error Code:   500

Error Message:
JSPG0228E: Exception caught while translating /themes/html/IBMSearch/Default.jsp: error in statically included file 
/themes/html/IBMSearch/head_externalJS.jspf(12,37) --> JSPG0009E: Unable to load tag handler class com.ibm.wps.cacheproxy.CacheProxyUrlTag