Failed to build image to flash the board.

I use ccs10.0.1.00010, simplelink 4_30 uniflash 6.1.0
I can build program under ubuntu 18.04
a board with CC3220SF, need to build image to download to the board.
I failed when trying to:
~/ti/uniflash_6.1.0$ ./dslite.sh --mode cc32xx device info --port /dev/ttyUSB3
Executing the following command:
> ./SLImageCreator device info --port /dev/ttyUSB3
For more details and examples, please refer to the UniFlash Quick Start guide.
Traceback (most recent call last):
File "<string>", line 20, in <module>
File "/home/user/Downloads/sl_image_creator_gen3/venv_ic/lib/python2.7/site-packages/PyInstaller/loader/pyimod03_importers.py", line 363, in load_module
File "/home/user/Downloads/sl_image_creator_gen3/antimanifest.py", line 9, in <module>
File "/usr/lib/python2.7/subprocess.py", line 710, in __init__
stdout_thread.setDaemon(True)
File "/usr/lib/python2.7/subprocess.py", line 1327, in _execute_child
print "Looking for 'PROMPT' in set output..."
OSError: [Errno 2] No such file or directory
SLImageCreator returned -1