70, MESH ASSERT at 0x00023680

Hello,I have couple of nRF52832 boards,nrf5_SDK_for_Mesh_v0.9.2-Alpha.

I want to test the light control example,but some problem bother me.

It can not work normaly.The log as follow.

<t:          0>, main.c,  318, ----- BLE Mesh Light Control Client Demo -----
<t:          0>, main.c,  323, ----- leds init -----
<t:          0>, main.c,  325, ----- buttons init -----
<t:          0>, main.c,  108, Initializing softdevice
<t:          0>, nrf_mesh_sdk.c,  109, Initializing SoftDevice...
<t:          3>, nrf_mesh_sdk.c,  118, Ram base: 0x200022D8
<t:         24>, nrf_mesh_sdk.c,  123, sd_ble_enable: app_ram_base should be adjusted to 0x20001900
<t:         33>, main.c,  116, Initializing mesh stack
<t:        277>, nrf_mesh_sdk.c,   70, MESH ASSERT at 0x00023680