html report doesn't work with root node

[wim]

Hi, I receive following error when generating the whole project.
An error occured while loading data files, please confirm that all files have been generated and are intact

When I select the subnodes I can generate for each of them the htmlreport.
We have one RootNode then one subnode with childs. We can generate the htmlreport for the Subnode and all its childs but we can't do it if we select the rootnode.

Regards,