XSLTListViewWebPart returns: WebPartPageUserException

Today I added a XSLTListViewWebPart to my Site Definition and I receivede the following error: WebPartPageUserException: Guid should contain 32 digits with 4 dashes (xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx). My ListId in the XML … read the xsltlistviewwebpart-returns-webpartpageuserexception-guid-should-contain-32-digits-with-4-dashes-xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx post