CCS3.3下XDS510U怎么无法连接DM642的板啊？

Error connecting to the target:
Error 0x80002240/-121
Fatal Error during: Initialization, OCS, Control,
This error was generated by TI's USCIF driver.

SC_ERR_CMD_HANDLE <-121>
A bad controller handle has been given to a function,
either before attempting to open the controller, or after
having opened the controller and ignored its error status.
Valid controller handles are generated when attempts
to open the controller return a clean error status.


Sequence ID: 0
Error Code: -121
Error Class: 0x80002240
I/O Port = 240

Board Name: C64xx XDS510 Emulator
Cpu Name: CPU_1

Abort:                Close Code Composer Studio.
Retry:                Try to connect to the target again.
Cancel:                Remain disconnected from the target
Diagnostic:        Run diagnostic utility.

你好，一般510系列都会在配置的时候配CFG文件，不知道是否配置了。