ISSUE IN lightstreamer.stream TYPE OF THE subscription command

Yousef2006

Hello every one

I'm trying to subscribe in light streamer using COMMAND type

this is my subscription details

subscription = Subscription(
mode="COMMAND",
items=["LStocks","pick:xxxx"],\

fields=["key","command","data"])

subscription.setFieldSchema("key,command,data")
subscription.setDataAdapter("***********")
subscription.setRequestedSnapshot("yes")
subscription.setRequestedMaxFrequency("unlimited")

always getting the below error

Yousef2006

this is my information

2024-11-20 20:38:54.787743|DEBUG|lightstreamer.stream|Thread-2 (hx_local_0)|HTTP sending: https://xxxxxxxxxxxxxxxxxxxxxxxxa/lightstreamer/control.txt?LS_protocol=TLCP-2.1.0&LS_session=Sb64c105a8ca3cc7dMf94T3854395 LS_reqId=1&LS_op=add&LS_subId=1&LS_mode=COMMAND&LS_group=LStocks%20pick%3A1020&LS_schema=key%2Ccommand%2Cdata&LS_data_adapter=FEEDER_ADAPTER&LS_snapshot=true&LS_requested_max_frequency=unlimited headers(null)
2024-11-20 20:38:55.214472|DEBUG|lightstreamer.stream|LS_IO|HTTP event: text(CONOK,Sb64c105a8ca3cc7dMf94T3854395,50000,5000,*)
2024-11-20 20:38:55.242514|DEBUG|lightstreamer.stream|LS_IO|HTTP event: text(NOOP,sending placeholder data)
2024-11-20 20:38:55.242514|DEBUG|lightstreamer.protocol|Thread-2 (hx_local_0)|CONOK Sb64c105a8ca3cc7dMf94T3854395 50000 5000 *