CC3551E: Error connecting to the target(Error -615)

Tool/software:

I am attempting to debug a example project and I followed Quickstart CC35XX User's Guide 8.21.00.x,but CCS gives this error:

CS_DAP_0: Error connecting to the target: (Error -615 @ 0x0) The target failed to see a correctly formatted SWD header. The connection to the target may be unreliable. Try lowering the TCLK setting before trying again. (Emulation package 12.7.0.00130)

Here is the message from console:

CS_DAP_0: GEL Output: DAP on startup cc35x1
APP_MCU: GEL Output: M33 on startup cc35x1
CS_DAP_0: FlashDeviceOsprey:: Flash loader: CC35xx_FLASH_LIBRARY_VERSION 1.0.93.2
CS_DAP_0: FlashDeviceOsprey:: FlashDeviceOsprey.cpp last changed: Dec 22 2024 17:09:17
APP_MCU: GEL Output: File was loaded successfully. -0
APP_MCU: GEL Output: Only symbols were loaded
CS_DAP_0: FlashDeviceOsprey::RunToolbox 
CS_DAP_0: FlashDeviceOsprey::Programming 
CS_DAP_0: FlashDeviceOsprey::Programming cmd: simplelink-wifi-toolbox.exe programmer -i XDS110 -param1 auto programming --tool_settings programmer/programming/jsons/tool_settings.json --verbose 
CS_DAP_0: ReadFromPipe::before
CS_DAP_0: FlashDeviceOsprey::Programming 
CS_DAP_0: FlashDeviceOsprey::Programming cmd: simplelink-wifi-toolbox.exe programmer -i XDS110 -param1 auto debug --debug_dssm_req_path programmer/programming/images/dssm_req_debug.sign.bin --path_to_tbl programmer/programming/images/tbl.sign.bin --verbose 
CS_DAP_0: ReadFromPipe::before
CS_DAP_0: Error connecting to the target: (Error -615 @ 0x0) The target failed to see a correctly formatted SWD header. The  connection to the target may be unreliable. Try lowering the  TCLK setting before trying again. (Emulation package 12.7.0.00130) 

The CCS version used is 12.7.1, and the example project CC35xx_network_terminal in simplelink_wifi_sdk_8_41_0_0_eng.

I would greatly appreciate any suggestions for resolving this issue.

Thanks in advance.