on compiling a Assembly program in KEIL uVIsion 5 i have got this error
Error #602: 'Keil.MDK-Pro::File System:CORE:SFN:6.6.0': component requires valid MDK-ARM Professional license
can anyone say the way to clear this error
You could probably clear that error by acquiring a professional licence.
The simplest way to achieve this is take the traditional approach; i.e., buy one.
Contact your local distributor to get a quote: http://www.keil.com/distis/
You can also evaluate MDK Professional for a week: http://www.keil.com/support/man/docs/license/license_eval.htm
Note that, if you have already evaluated this previously, it will not work !