ISCSI, the device is not ready

[roadtodebian]

Hello,

I build freenas system using lenovo x3250 series, and everything is fine. Suddenly i cannot access iscsi sharing. I try to reconnect iscsi from my windows 7 pc, but failed and showing notification "the device is not ready". Restart the whole system, and service with no result. Please need some help. Thx

Show : Screenshot

 

[mullinsj08]

There's no dataset called extent1 in the second screenshot?