AM263P4: am263px 10.0.0.35 SDK examples generate build error: ModuleNotFoundError: No module named 'elftools'

Part Number: AM263P4

Tool/software:

just downloaded mcu_plus_sdk_am263px_10_00_00_35.  Imported 2 projects, and both caused the same error:

[106] Boot multi-core ELF image: am263px:r5fss0-0:nortos:ti-arm-clang C:/Users/sesa780559/workspace_ccstheia/uart_echo_interrupt_lld_am263px-cc_r5fss0-0_nortos_ti-arm-clang/Release/uart_echo_interrupt_lld_am263px-cc_r5fss0-0_nortos_ti-arm-clang.mcelf ...
[107]python C:/ti/mcu_plus_sdk_am263px_10_00_00_35/tools/boot/multicore-elf/genimage.py --core-img=0:Release/uart_echo_interrupt_lld_am263px-cc_r5fss0-0_nortos_ti-arm-clang.out --output=C:/Users/sesa780559/workspace_ccstheia/uart_echo_interrupt_lld_am263px-cc_r5fss0-0_nortos_ti-arm-clang/Release/uart_echo_interrupt_lld_am263px-cc_r5fss0-0_nortos_ti-arm-clang.mcelf --merge-segments=true --tolerance-limit=0 --ignore-context=false --xip=0x60000000:0x68000000 --xlat="" --max_segment_size=8192
[108]makefile_ccs_bootimage_gen:90: recipe for target 'all' failed
[109]Traceback (most recent call last):
[110] File "C:\ti\mcu_plus_sdk_am263px_10_00_00_35\tools\boot\multicore-elf\genimage.py", line 35, in <module>
[111] from modules.multicoreelf import MultiCoreELF
[112] File "C:\ti\mcu_plus_sdk_am263px_10_00_00_35\tools\boot\multicore-elf\modules\multicoreelf.py", line 36, in <module>
[113] from elftools.elf.elffile import ELFFile
[114]ModuleNotFoundError: No module named 'elftools'
[115]gmake[3]: *** [all] Error 1
[116]makefile:167: recipe for target 'post-build' failed
[117]gmake[2]: [post-build] Error 2 (ignored)

Examples were icss_emac_lwip-am263px-cc_r5fss0-0_freertos_ti-arm-clang and uart_echo_interrupt_lld_am263px-cc_r5fss0-0_nortos_ti-arm-clang.