Facing an error while running Cucumber with selenium

hi friends

while running my test cases im getting the following error

requested:
cmd=isTextPresent
1=sydney
sessionId=60d074397ead45d1ad0272a01db41c3c
received:
“ERROR: Couldn’t access document.body. Is this HTML page fully loaded?”
called from /home/nandhini/.gem/ruby/1.8/gems/rspec-1.3.0/lib/spec/expectations/handler.rb:11:in `handle_matcher’
…------…--------…Tue Feb 16 16:30:02 +0530 2010 selenium-client received failure from selenium server:

im using cucumber -v 0.4.4 & selenium-client.even though my case are passed im getting the above error in my prompt.