Multicast: No downlink path available

End Devices (Nodes)
4

I am also getting the same error when trying to send downlink with multicast device. I am getting “no downlink path available” message. I am trying to publish below JSON in JSON-box of downlink message:

{“downlinks”:[{
“frm_payload”: “vu8=”,
“f_port”: 200,
“priority”: “NORMAL”,
“class_b_c”: {
“gateways”: [
{
“gateway_ids”: {
“gateway_id”: “ttn-gw-id”
}
}
]
}
}]
}

I hope I am not making a mistake here. Kindly let me how can I send multicast downlink.