AVR-Chat

I am having a strange problem.  Using the AVR Assembler whic is 
integrated into AVR Studio 4,I am running into problems with register 
identification.

Example:

    mov   r2,   r16      ;  copy status to high register

  This results in multiple "illegal register" errors.    Why?    I am 
including the appropriate .def file for the processor in question at the 
top of my source file.

   No matter what registers I use,they show up as errors.  Lower or 
upper case, high or low registers.  What am I doing wrong, please?

Tom Keller
aka avrFreak on efNet and freenode