ambiguous set command

hi friends ,

    i am running simulavr in the background and then using gdb as the
debugger for 

my program for the device at90s8515. during debugging process when I  type 

set b = 50 at the (gdb) prompt , it gves the following error :

            Ambiguous set command  "b=50" ; backtrace , breakpoint

(gdb) print b is working fine .

what can be the reason for this error.( I am using gdb 6.4).

tej
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