list index out of range

[meymself]

File "/script/iperf.py", line 30, in my_iperf3
return client.run()
File "/usr/local/lib/python3.7/dist-packages/iperf3/iperf3.py", line 621, in run
data = '{' + data.split('{', 1)[1]
IndexError: list index out of range