Error when copying an image in Photoshop

Hi, I am new to Photoshop. I hope someone can help me with this error message (please see below). I copied an image to my canvass and tried selecting it when I got the error message. I wondered why this happened when I was selecting the image that I just copied.
Any advice on what to do?

Adobe Photoshop CS5
Could not move the selection because the selection area is empty.
