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

Part Number: CC3551E

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) 
I tried Lowering the TCLK to 1 MHz and even 100 kHz,but it doesn't work.

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.