1: Target add target object (the object that will eventually inherit the shape mapping), source add original object (and vice versa).

2: The position of the target object, try to be the same as the position of the original object. And the target object will try to slightly wrap the original object in it. It is enough to encapsulate some of the inherited details of the original object.

3: Note that Targer targets must be UV'd before they can be baked.

4: The path to the Normal map must be Chinese. (In fact, on my machine Chinese path is no problem, but just in case, you still use the English path.)

B: If you are sure that there is no problem with the hardware, and do the above 4 points. Then

C:\Documents and Settings\weilai\My Documents\maya folder delete. Reopen MAYA and try again.

C: If you still have this problem, you can only reinstall MAYA.

There is no other way.

C: If you still get the problem, you have to reinstall MAYA.