Application Server Error

The first time I installed SoupUi it work fine. Then I started getting the error below. I reinstalled SoupUi but still get the same error. Any ideas ?

Thanks in advance
John


content-type text/html
connection close
#status# HTTP/1.0 400 protocol error
content-length 1880
server SAP Web Application Server
date Wed, 01 Jul 2009 13:24:37 GMT