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Not able to compile C files

Sir/Madam
I'm not able to compile the EXAMPLES that is given with the keil product(but im able to do the assembly code not C files).i hav gon through the manuals given with the product.when i compile the example HELLO(one example among many)it gives the foll :
warning C500:MISSING DEVICE (SECURITY KEY NOT FOUND) .... .... ....
FATAL ERROR L210:I/O ERROR ON INPUT FILE
EXCEPTION 0021H:PATH OR FILE NOT FOUND
FILE :HELLO.OBJ
TARGET NOT FOUND

PLEASE HELP

  • C500:MISSING DEVICE (SECURITY KEY NOT FOUND)

    You are attempting to use the full, licensed tools without the necessary hardware security key (The "dongle")

    Note, if you have a parallel-port dongle, there are specical instructions for setting it up to work on Windows NT and later systems...