Unknown function at 0xA60

[whoosh]

Hello,

I am new to the NRF52 SoC and BLE development. I've been using the ble_app_template and following along this tutorial to learn more about BLE development. I'm having a problem when attempting to connect using the NRF Connect mobile app to my NRF52 DK. The steps are as follows:

1. Run the compiled binary on the dev board through SEGGER. At this point, LED1 on the NRF52 DK is blinking.
2. Open the NRF Connect mobile app and locate the NORD device.
3. Connect to the NORD device on the mobile app

When I connect to the NORD device, LED1 NRF52 DK stops blinking and the mobile immediately brings me to a blank Client tab with the status "DISCONNECTED NOT BONDED". When I step through the program in Segger and get to this point in the execution, I obtain the error Unknown function 0xA60.

Does anyone have any insight as to what this means and how I can fix it?

Thanks in advance for any help.

[whoosh]

Just a heads up, I found someone having the exact same problem as me. A more detailed problem description is that when I attempted to connect using NRF Connect Mobile app, I was unable to connect due to Error 133 (0x85): Gatt error. 

I realized by tracking local variables that the evt_handler variable was 0x00  upon entry into this code. I resolved the issue as described in this previous post: devzone.nordicsemi.com/.../error-133-0x85-gatt-error-with-custom-service-tutorial