I have installed striker with all the depandencies but i keep getting this issue

[fachatti-amine]

command executed: python3 striker.py

.
. . . .
. . Striker . .
. . . .
. . .
.

[^] Running component level check
[^] Starting engine
[^] Turning on radar
Traceback (most recent call last):
File "striker.py", line 42, in
source_1 = findsubdomains(sys.argv[1])
IndexError: list index out of range
Error in sys.excepthook:
Traceback (most recent call last):
File "/usr/lib/python3/dist-packages/apport_python_hook.py", line 153, in apport_excepthook
with os.fdopen(os.open(pr_filename,
FileNotFoundError: [Errno 2] No such file or directory: '/var/crash/_opt_Striker_striker.py.1000.crash'

Original exception was:
Traceback (most recent call last):
File "striker.py", line 42, in
source_1 = findsubdomains(sys.argv[1])
IndexError: list index out of range

[jackson-jackson]

You're missing the domain. $ python3 striker.py example.com