Invalid field name. {8c06beca-0777-48f7-91c7-6da68bc07b69}

Hi 

i tried to add Content Query and edit it , but i get 

Invalid field name. {8c06beca-0777-48f7-91c7-6da68bc07b69}

its very frustrating then i have looked everyway to finds a solution without  success

and another thing i see is that everytime i add content Query to the site get another webpart  Webart 26  and webpart 27,

Any Ideas is Welcome now :-)

Regards

Boniek