BQ27531-G1: during the learning cycle, [VOK] is not cleared after relax for 2 hrs

Part Number:BQ27531-G1

Hi, Ti 

I'm using the BQ27531-G1 + BQ24192.

And I do the cycle learning forllowing the instruction of http://www.ti.com.cn/cn/lit/an/slua597/slua597.pdf .

After charging the battery, the [FC] bit is set , so I stop charging, and let it relax for over 2 hrs, but the [VOK] is not cleared.

How is that?