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[Edited Message Follows]

I testing the asset_tracker sample application after adding custom code. The prj.conf is as below:
# Copyright (c) 2021 Nordic Semiconductor ASA
#
# SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
#

# General config
CONFIG_NEWLIB_LIBC=y
CONFIG_NEWLIB_LIBC_FLOAT_PRINTF=y
CONFIG_ASSERT=y
CONFIG_REBOOT=y

CONFIG_RESET_ON_FATAL_ERROR=n
CONFIG_FPU=y

# Heap and stacks
CONFIG_HEAP_MEM_POOL_SIZE=64768
CONFIG_MAIN_STACK_SIZE=16384
CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=8192
CONFIG_HW_STACK_PROTECTION=y
# Increase AT monitor heap size to be able to fit both neighbor cell measurement
# and other AT notifications that may come in rapid succession.
CONFIG_AT_MONITOR_HEAP_SIZE=2048

# Logging
CONFIG_LOG=y


# nRF modem library
# CONFIG_NRF_MODEM_LIB=y

# AT Host library - Used to send AT commands directy from an UART terminal and to allow
# integration with nRF Connect for Desktop LTE Link monitor application.
CONFIG_AT_HOST_LIBRARY=y

# Network
CONFIG_NETWORKING=y
CONFIG_NET_NATIVE=n
CONFIG_NET_SOCKETS=y
CONFIG_NET_SOCKETS_OFFLOAD=y

# LTE link control
CONFIG_LTE_AUTO_INIT_AND_CONNECT=n
CONFIG_LTE_NETWORK_MODE_LTE_M_GPS=y
## Power saving timers.
### 320 hours PSM.
CONFIG_LTE_PSM_REQ_RPTAU="11000001"
### 20 seconds active time.
CONFIG_LTE_PSM_REQ_RAT="00001010"

# Modem info library to obtain information about network and device
CONFIG_MODEM_INFO=y

# Settings - Used to store real-time device configuration to flash.
CONFIG_SETTINGS=y
CONFIG_SETTINGS_FCB=y
CONFIG_FCB=y

# FOTA
CONFIG_FOTA_DOWNLOAD=y
CONFIG_DFU_TARGET=y
CONFIG_DOWNLOAD_CLIENT=y
CONFIG_DOWNLOAD_CLIENT_HTTP_FRAG_SIZE_1024=y
CONFIG_DOWNLOAD_CLIENT_STACK_SIZE=4096
CONFIG_DOWNLOAD_CLIENT_BUF_SIZE=4096
CONFIG_DOWNLOAD_CLIENT_MAX_HOSTNAME_SIZE=255

# Flash - Used in FOTA, settings and storage for P-GPS.
CONFIG_FLASH=y
CONFIG_FLASH_PAGE_LAYOUT=y
CONFIG_FLASH_MAP=y
CONFIG_STREAM_FLASH=y
CONFIG_MPU_ALLOW_FLASH_WRITE=y

# MCUBOOT
CONFIG_BOOTLOADER_MCUBOOT=y
CONFIG_IMG_MANAGER=y
CONFIG_MCUBOOT_IMG_MANAGER=y
CONFIG_IMG_ERASE_PROGRESSIVELY=y

# Watchdog
CONFIG_WATCHDOG_APPLICATION=y

# Event Manager
# CONFIG_EVENT_MANAGER=y
# CONFIG_EVENT_MANAGER_LOG_EVENT_TYPE=n

# cJSON - Used in cloud data encoding.
CONFIG_CJSON_LIB=y

# CAF - Common Application Framework
CONFIG_CAF=y
CONFIG_LED=y
CONFIG_CAF_LEDS=y
CONFIG_CAF_INIT_LOG_LED_READY_EVENTS=n
CONFIG_CAF_INIT_LOG_LED_EVENTS=n
CONFIG_CAF_INIT_LOG_MODULE_STATE_EVENTS=n
CONFIG_ASSET_TRACKER_V2_APP_VERSION="cellcheck_v.0.86b"




CONFIG_DATA_ACCELEROMETER_BUFFER_STORE=y
CONFIG_DATA_ACCELEROMETER_THRESHOLD=5
CONFIG_DATA_ACTIVE_TIMEOUT_SECONDS=20
CONFIG_DATA_MOVEMENT_RESOLUTION_SECONDS=20
CONFIG_DATA_MOVEMENT_TIMEOUT_SECONDS=40
CONFIG_SENSOR_THREAD_STACK_SIZE=4096




The error is copied from LTE TERMINAL as shown in image.
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[cid:attach_0_172D1EF07219F1A1_1691@groups.io]