XML Parsing Error at 1:0. Error 4: not well-formed (invalid token)

Hi! I got this error message installing the latest version of The World News II on Joomla 1.5.23.

XML Parsing Error at 1:0. Error 4: not well-formed (invalid token)

Is it a material issue which we have to be concerned of or can we just ignore it. I don't get this error installing other extensions on the same site. Please let me know how to fix it. Thank you!!!

If you are talking about just installing quick install package and having that error i dont think there is any problems as i ve installed it many times on my local installation so i assume its browser related or if you have installed any plugins or modules afterwards.