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warnings during linking: undefined symbol fs_data$$Base and fs_data$$Limit

I was just working with the ble_app_uart example in nrf5_SDK_12.2.0. Minor modification were done to the main function. The build output:

linking... ._build\nrf52832_xxaa.axf: Warning: L6330W: Undefined symbol fs_data$$Base (referred from fstorage.o). Unused section has been removed. ._build\nrf52832_xxaa.axf: Warning: L6330W: Undefined symbol fs_data$$Limit (referred from fstorage.o). Unused section has been removed.

I have no idea what they mean and how to deal with. It seems they don't have much impact on building the target, but quite annoying……Is there any solutions?

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