Error while assembling the code

Sir,
I was using the Keil uVision3 to simulate an 8051 assembly program using P89V51RD2 device. The program assembly code is written below:

ORG 00H
MOV A, #51H
MOV R1, A
END

Sir, I followed all the procedures given in the tutorial of Keil uVision3, but, when I clicked on "Translate Current file" tab, the following error was shown:

assembling p1.asm...
--- Error: can't execute 'C:\Keil\C51\BIN\A51.EXE'
p1.asm - 1 Error(s), 0 Warning(s).

Sir, please let me know what does this error mean and what can I do to eliminate this error as soon as possible.

Thanking you in anticipation.
-Sameer

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