hi everyone!
i am using apache-tomcat-6.0.18 on my fedora 10 system.
i am feeling a strange problem. whenever i deploy i .war file it works fine.
but when next time i try to use that project, it gives errors such as resource not found and error like internal error() occured. and when i tried to access tomcat manager it gives...error...
This request requires HTTP authentication ().

sometimes it gives errors like
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
javax.servlet.ServletException: sun/tools/javac/Main
org.apache.jasper.servlet.JspServlet.service(JspSe rvlet.java:399)
javax.servlet.http.HttpServlet.service(HttpServlet .java:729)
why this happenning?
everything works fine after a fresh tomcat installation.