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nrf52 usbd log problem

Hi,

I'm trying to obtain as much information as possible about my usb connection with Nordic chip. I'm working on DK board with nRF840, sdk14 and usbd_msc example. My problem is: when I set APP_USBD_CONFIG_LOG_ENABLED 1 in sdk_config, linker throws error: undefined reference to `m_nrf_log_app_usbd_logs_data_dynamic'  in _build/nrf52840_xxaa/app_usbd.c.o
I tryied to find m_nrf_log_app_usbd_logs_data_dynamic in sdk files using Eclipse tools, but I get nothing.