Hi,
I am working on a personal project, and I have added my own functions in the ble_app_template project. I was trying to add the UART functionality in this project, based on the UART example in the peripheral folder.
However, I had to modify my sdk_config.h to add this feature, but whenever I make changes to it, my project simply fails to build. I have added the APP_UART_DRIVER_INSTANCE. (Below is a screenshot).
Is there a particular procedure we should follow to correctly modify the sdk_config.h file? Any suggestions to resolve this issue would be helpful. I am using nrf52840 and SDK 17.0.2.

Thanks,
Ananye