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Error: Flash Download failed - Target DLL has been cancelled

how can i rectify this?

Is it of hardware issue or any library functions is missing?

can any one please help

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  • - Debug Adapter 

    If it's a 3rd-party adaptor (eg, J-Link, ST-Link), they usually come with their own utilities. Your first step should be to use those utilities to see if the adaptor on its own is working.

    • If the adaptor on its own is working - then you have a problem related to Keil;
       
    • the adaptor on its own is not working - then you have a fundamental problem that is nothing to do with Keil.