The page you tried to access (<%=RequestUtil.filter(("))%>) does not exist.
The Host Manager application has been re-structured for Tomcat 7 onwards and some URLs have changed. All URLs used to access the Manager application should now start with one of the following options:
Note that the URL for the text interface has changed from "uu
You probably need to adjust the URL you are using to access the Host Manager application. However, there is always a chance you have found a bug in the Host Manager application. If you are sure you have found a bug, and that the bug has not already been reported, please report it to the Apache Tomcat team.