Trash folder not working
When I drag and drop a file into the trash folder I get the message "This item will be deleted immediately. You can’t undo this action." Hence nothing goes to the trash folder any more. I created this problem by using Teminal utility and trying to rename a file on a desktop folder, it didn't work. But when I quit the Terminal utility and started to move files from my desktop to Trash, it failed, giving me the above message in quotes. How do I restore the normal functionality of the Trash folder?
MacBook Pro, Mac OS X (10.7)