error loadxml

I have the following error.

Error Type loadXML
Description Incorrect XML
I dont change something.
I get this error in the original sample of dhtmlxGrid\samples\04_dataprocessor\01_basic_init.html
what´s wrong. No sample works corrct on my system. I have altered the config.php with the connect data of my system what must I do otherwise?

How the xml must be created from the database table.
Do you have an example so I can check whats wrong.
Or do you have the skript to create the database automatically with all the referenced tables? I created the table samples manually.