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Undefine reference to "app_timer_start"

Hi,

I faced a problem while building my project. Please see screenshot below

I think I have already include all the files and everything compiled. But this error shows up at the very end. Please advise. 

Thank you.

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  • Hi guys,

    Thank you for the speedy reply. I've included the app_timer.h and app_timer.c. 

    After I enabled the app timer in sdk_config.h, I did it by change from "APP_TIMER_ENABLED 0" to "APP_TIMER_ENABLED 1". Is this the correct way to do it?

    If this is the correct way, after I enable the app timer, I got another error shown in the attach picture. 

    Is this something to do with settings in sdk_config again?

    Thank you for helping again.

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