keying set failed to insert any keyframes

hey guys,

Today I was making a animation of a submarine

but at the end it got the error: keying set failed to insert any keyframes
and i realy dont know how to fix it can any one help me plz?
I am using blender v2.55

                Thank you in advance.

Tim

http://blenderartists.org/forum/showthread.php?t=192939&page=1