[Building Sakai] Urgent Help

[Omer A Piperdi]

  Our Sakai server starts throwing following errors... Does anyone seen 
this before / any resolution?

Thanks
Omer

2010-10-25 15:57:38,810  WARN http-8443-Processor45 
org.sakaiproject.access.tool.AccessServlet - doLogin - proceeding with 
null HELPER_DONE_URL
2010-10-25 15:57:39,094  WARN http-8443-Processor66 
org.apache.tomcat.util.http.Parameters - Parameters: Character decoding 
failed. Parameter skipped.
java.io.CharConversionException: isHexDigit
         at org.apache.tomcat.util.buf.UDecoder.convert(UDecoder.java:87)
         at org.apache.tomcat.util.buf.UDecoder.convert(UDecoder.java:48)
         at 
org.apache.tomcat.util.http.Parameters.urlDecode(Parameters.java:411)
         at 
org.apache.tomcat.util.http.Parameters.processParameters(Parameters.java:393)
         at 
org.apache.tomcat.util.http.Parameters.processParameters(Parameters.java:344)
         at 
org.apache.catalina.connector.Request.parseParameters(Request.java:2445)
         at 
org.apache.catalina.connector.Request.getParameter(Request.java:1006)
         at 
org.apache.catalina.connector.RequestFacade.getParameter(RequestFacade.java:353)
         at 
org.sakaiproject.util.RequestFilter.assureSession(RequestFilter.java:1139)
         at 
org.sakaiproject.util.RequestFilter.doFilter(RequestFilter.java:614)
         at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)
         at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
         at 
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
         at 
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:172)