ixnetwork.Timeline.CreateTest(Arg2="rfc2544back2back", Arg3="none") returns error

[hshakaryan]

"""Demonstrates creating ospfv2 devices

"""
from ixnetwork_restpy import SessionAssistant

session_assistant = SessionAssistant(
UserName="admin",
Password="admin",
LogLevel=SessionAssistant.LOGLEVEL_INFO,
ClearConfig=True,
)
ixnetwork = session_assistant.Ixnetwork

ipv41 = (
ixnetwork.Topology.add(Vports=ixnetwork.Vport.add())
.DeviceGroup.add(Name="Dg West")
.Ethernet.add()
.Ipv4.add(Name="Ipv4 West")
)

ipv42 = (
ixnetwork.Topology.add(Vports=ixnetwork.Vport.add())
.DeviceGroup.add(Name="Dg East")
.Ethernet.add()
.Ipv4.add(Name="Ipv4 East")
)

traffic = ixnetwork.Traffic.TrafficItem.add(Name="West -> East", TrafficType="ipv4")
traffic.EndpointSet.add(Sources=ipv41, Destinations=ipv42)

test_details = ixnetwork.Timeline.CreateTest(Arg2="rfc2544back2back", Arg3="none")
print(test_details)
test = ixnetwork.parent.GetObjectFromHref(test_details["arg1"])
test.TrafficItemIds = traffic