Problem in sending logs with Individual stream forwarder to Splunk indexer

[el666nino]

hello everyone
I have an ISF for send stream logs to my Splunk indexer
 the logs in  "/opt/streamfwd/var/log"
show that this error is happening:

2021-12-03 22:56:08 ERROR [140397528004352] (HTTPRequestSender.cpp:1408) stream.SplunkSenderHTTPEventCollector - (#7) HTTP request [https://splunk:8088/services/collector/event?index=_internal&host=stream&source=stream&sourcetype=st...] response = 400 Bad Request {"text":"Incorrect index","code":7,"invalid-event-number":1}