Can’t move to trash or delete anything

Always when I try to move to trash there is a message: "The Duplicate Finder was unable to move this file to Trash. Do you want to delete it permanently?” them I select “Delete” and the file is not deleted. In this case the program displays a message: “Failed to Delete Files: The Duplicate Finder was unable to permanently delete some files. Please check their permission for succesful removal. The files are left in your selection list.”. So almost completely useless :(

juniorBra about The Duplicate Finder, v2.0