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Error code: -3 with CC3200

Hi,:TI

I am Participating in the Iot game,I get the board when the time is good, when I built engineers in the CCS, and then downloaded into the uinflash to die, how can I do, and then buy another one?Here is the uniflash hint,Did it get some trouble in FTDI?:

[09:41:22] Begin Format operation.
[09:41:23] INFO: > Executing Operation: Connect
[09:41:25] INFO: setting break signal
[09:41:26] INFO: detecting FTDI for device reset
[09:41:41] ERROR: ---reading ACK signal failed---
[09:41:41] WARNING: ---seting break signal to false failed---
[09:41:43] INFO: setting break signal
[09:41:44] INFO: detecting FTDI for device reset
[09:42:00] ERROR: ---reading ACK signal failed---
[09:42:00] WARNING: ---seting break signal to false failed---
[09:42:02] INFO: setting break signal
[09:42:03] INFO: detecting FTDI for device reset
[09:42:18] ERROR: ---reading ACK signal failed---
[09:42:19] WARNING: ---seting break signal to false failed---
[09:42:21] INFO: setting break signal
[09:42:22] INFO: detecting FTDI for device reset
[09:42:37] ERROR: ---reading ACK signal failed---
[09:42:37] WARNING: ---seting break signal to false failed---
[09:42:37] FATAL: --- Can't connect to device !! ---
[09:42:50] FATAL: Error connecting to the device. Please check your COM port settings. Error code: -3
[09:42:50] INFO: > Executing Operation: Disconnect
[09:42:50] Operation Format returned.
[09:42:57] Begin Format operation.
[09:42:57] INFO: > Executing Operation: Connect
[09:42:59] INFO: setting break signal
[09:43:00] INFO: detecting FTDI for device reset
[09:43:01] Cancelling current process <Format>, please wait...
[09:43:16] ERROR: ---reading ACK signal failed---
[09:43:16] WARNING: ---seting break signal to false failed---
[09:43:18] INFO: setting break signal
[09:43:19] INFO: detecting FTDI for device reset
[09:43:34] ERROR: ---reading ACK signal failed---
[09:43:35] WARNING: ---seting break signal to false failed---
[09:43:37] INFO: setting break signal
[09:43:38] INFO: detecting FTDI for device reset
[09:43:53] ERROR: ---reading ACK signal failed---
[09:43:53] WARNING: ---seting break signal to false failed---
[09:43:55] INFO: setting break signal
[09:43:56] INFO: detecting FTDI for device reset
[09:44:07] ERROR: ---reading ACK signal failed---
[09:44:07] WARNING: ---seting break signal to false failed---
[09:44:07] FATAL: --- Can't connect to device !! ---
[09:44:07] FATAL: Error connecting to the device. Please check your COM port settings. Error code: -3
[09:44:07] INFO: > Executing Operation: Disconnect