Default [Q]Problem with fastboot mode

I have a st26i with bootloader unlocked,and was installing cwm (boot.img)
And this error occurs
Quote:
21/008/2014 10:08:09 - INFO - Device connected with USB debugging on
21/008/2014 10:08:09 - INFO - Connected device : Sony Xperia J
21/008/2014 10:08:09 - INFO - Installed version of busybox : BusyBox v1.20.2-Stericson (2012-07-04 21:33:31 CDT) multi-call binary.
21/008/2014 10:08:09 - INFO - Android version : 4.1.2 / kernel version : 3.4.0 / Build number : 11.2.A.0.31
21/008/2014 10:08:09 - INFO - Checking root access
21/008/2014 10:08:15 - INFO - Root Access Allowed
21/010/2014 10:10:21 - INFO - Device disconnected
21/010/2014 10:10:35 - INFO - Device connected in flash mode
21/010/2014 10:10:47 - ERROR - This action can only be done in fastboot mode
21/011/2014 10:11:18 - INFO - Device disconnected
Before I flash without any problem, it is only today that the problem occurred.
I'm using version 0.9.16.1 of FlashTool
Anyone know how to solve this problem?
Thanks
Sorry my bad english!

| Device → Xperia J | Carrier → Nos | Rom → Seraphic Season 3 | Bootloader → Unlocked | Kernel→ Intuisy 7.3+ |