CCC3220SFLAUCHPAD：CCS debug出错

SDK:simplelink_cc32xx_sdk_4_20_00_07                CC3220SF

例程：mqtt_client

1. 在CCSdebug程序的时候出现了如下错误：

Error connecting to the target:
(Error -1170 @ 0x0)
Unable to access the DAP. Reset the device, and retry the operation. If error persists, confirm configuration, power-cycle the board, and/or try more reliable JTAG settings (e.g. lower TCLK).
(Emulation package 9.2.0.00002)

2. 我仍然可以用uniflash正常烧写固件程序

问题：

CCS的debug是哪里出现问题了呢？