Invalid or no XML schema in XML Forms Builder

Hi all

Could anyone help me with this?

When I try to preview an Forms example in XML Forms builder I've got the following error:

"Messages or errors reported while building the project Invalid or no XML schema information Error was: Invalid or no XML schema information "

Running EP6 SP2, JRE 1.4.2_05, IE 6.0

Thanks in advance

Mikael Lofberg