Hello,
There is a problem of compile when I finished compile process on Keil as following. Is there any process I missed before I starting to develop nRF52 SDK? what I used the SDK version is "nRF52_SDK_0.9.2_dbc28c9", and I have tried beacon and alert application.
I also have checked the problem, and it is related errata 66( a kind of workaround) at system_nrf52.c.