Problem on dfu_init

I have two boards, one is official demo board, the other I make PCB board.

I down the open-mesh source code form github.sdk version is 8.1,open mesh stack version is 0.8.7

Question, official board I use keil MDK-ARM simulate work well. The board I make fail on function:

uint32_t dfu_init(void);

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return NRF_ERROR_NOT_SUPPORTED.

The 32768k crystal oscillator I was placed near the chip, should not this causing problem.

I want to know what wrong, if anybody could help me.