hi: I installed the DK-ARM dev tools,including uv3 IDE and GNU gcc which are both supplied by the keil company.I opne the Demo project: keil\arm\gnu\measure\measure.uv2.Nothing to do but directly click the "build" icon on tool bar.However,the output window of uv3 IDE tells me the following error information: Build target 'AT91M55800A' assembling Startup.s... --- Error: can't execute 'arm-uclibc-as' Target not created I,m a beginner of arm,and don't know what's wrong with the Demo application.Thanks for giving me the right answer.