You can’t open the Trash because it’s being emptied

Trash is not working, with the message saying:  "You can’t open the Trash because it’s being emptied."  at the same time not able to shut down my computer...  What may I do?

One thing to try: Hold down option key, then press and hold Finder icon in dock. Select "Relaunch".

after this, it goes well with my U-disk.

thx.