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CCS/CC3200: CCS CC3200 debug"error connecting to target"&when flashing with error" ACK signal failed, can't connect divice"

Part Number: CC3200
Other Parts Discussed in Thread: UNIFLASH

Tool/software: Code Composer Studio

When I debug the blinky, it showed "error cnnecting to target".I'm sure my configeration like CCXML and hardware cooncting is right.
Then I steped to Uniflash. when I clicked the format button it  showed the problem like following:

[19:59:39] Begin Format operation.
[19:59:43] INFO: > Executing Operation: Connect
[19:59:43] FATAL: --- Can't connect to device !! ---
[19:59:46] FATAL: Error connecting to the device. Please check your COM port settings. Error code: 1
[19:59:46] INFO: > Executing Operation: Disconnect


My classmate's board can debug and flash in his computer. But since I debug and 'error connecting' in my computer, it can't work in any other computer with the same error. Even our configration is same(our CCS and SDK version is not the same).