nRF5340 FOTA over BLE issue

Hi,

Iam using nRF5340 DK and nRF Connect SDK V.2.6.1.

Iam following the link

FOTA over BLE

In this one until 5th step it worked fine and while doing 6th step it is showing error
Here Iam using peripheral lbs example
Then I add MCUboot and fota over bluetooth low energy to the application and add an extra print to the main to generate a new file for dfu
Then update the firmware using device manager app and it worked
Then I tried simultaneous updates for both cores
For this I added step 6 procedures
After adding the line CONFIG_UPDATEABLE_IMAGE_NUMBER=2 it is showing the errors

failed: "Missing partitions?"
87 | #define BUILD_ASSERT(EXPR, MSG...) _Static_assert(EXPR, "" MSG)

 BUILD_ASSERT(FIXED_PARTITION_EXISTS(SLOT2_PARTITION) &&

CMake Warning at B:/Nordic/v2.6.1/nrf/cmake/partition_manager.cmake:79 (message):

CMake Warning at B:/Nordic/v2.6.1/nrf/modules/mcuboot/CMakeLists.txt:382 (message):

BT_MAX_CONN set more than once. Old value "16", new value "10".

CMake Warning at B:/Nordic/v2.6.1/nrf/subsys/bootloader/cmake/debug_keys.cmake:36 (message):

CMake Warning at B:/Nordic/v2.6.1/zephyr/CMakeLists.txt:1957 (message):

Kindly help me to find a solution for this 

Thankyou

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