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error A3903U

hi..
I have some problem while Using keil uV version 4. Processor which i am using is LH7A404.
when i try to build the program
LH7A404.s: error: A3903U: Argument 'ARM722T' not permitted for option 'cpu'.
occurs on my build screen. I have also conforme that this version of keil support this processor.
I have tried all target options.
does anyone know the solution?

any suggetions are welcome.

ket.

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