rtp_receiver_threads parameter problem

[pumper]

Hi I compiled sems with instructions of wiki on debian 11 and installed it successfully. it runs and works normally .
I have a virtual machine with 32 core cpu and 32GB of ram and try to use sems for more than 5000 concurrent calls with 1500 cps so i tried to set rtp_receiver_threads=8 and restart sems. it seems everything works but i get alot of errors in sems log like thease:

Dec 21 13:02:25 sbc-dev sems[1060]: [#7f27b9b1b700] [addStream, AmRtpReceiver.cpp:151] ERROR: trying to insert existing stream [0x7f29a00070f0] with sd=231 Dec 21 13:02:25 sbc-dev sems[1060]: [#7f27b9b1b700] [addStream, AmRtpReceiver.cpp:151] ERROR: trying to insert existing stream [0x7f29cc000bf0] with sd=233 Dec 21 13:02:25 sbc-dev sems[1060]: [#7f27b9b1b700] [addStream, AmRtpReceiver.cpp:151] ERROR: trying to insert existing stream [0x7f29a00070f0] with sd=231 Dec 21 13:02:40 sbc-dev sems[1060]: [#7f27b44c5700] [addStream, AmRtpReceiver.cpp:151] ERROR: trying to insert existing stream [0x7f2ba0003010] with sd=1459 Dec 21 13:03:29 sbc-dev sems[1060]: [#7f27a2daf700] [addStream, AmRtpReceiver.cpp:151] ERROR: trying to insert existing stream [0x7f2828037fd0] with sd=1573 Dec 21 13:05:21 sbc-dev sems[1060]: [#7f2a3fafa700] [addStream, AmRtpReceiver.cpp:151] ERROR: trying to insert existing stream [0x7f2b08145d10] with sd=1033 Dec 21 13:08:50 sbc-dev sems[1060]: [#7f27bdf5f700] [addStream, AmRtpReceiver.cpp:151] ERROR: trying to insert existing stream [0x7f2968011450] with sd=237 Dec 21 13:09:33 sbc-dev sems[1060]: [#7f27c21a1700] [addStream, AmRtpReceiver.cpp:151] ERROR: trying to insert existing stream [0x7f2a2c099d90] with sd=247 Dec 21 13:09:53 sbc-dev sems[1060]: [#7f27ab435700] [addStream, AmRtpReceiver.cpp:151] ERROR: trying to insert existing stream [0x7f2aa8066e30] with sd=1145 Dec 21 13:10:19 sbc-dev sems[1060]: [#7f27a61e3700] [addStream, AmRtpReceiver.cpp:151] ERROR: trying to insert existing stream Dec 21 13:12:37 sbc-dev sems[1060]: [#7f283c2c2700] [addStream, AmRtpReceiver.cpp:151] ERROR: trying to insert existing stream [0x7f29fc104d10] with sd=949 Dec 21 13:12:40 sbc-dev sems[1060]: [#7f27a61e3700] [addStream, AmRtpReceiver.cpp:151] ERROR: trying to insert existing stream [0x7f2aa80008d0] with sd=231 Dec 21 13:14:16 sbc-dev sems[1060]: [#7f27a60e2700] [addStream, AmRtpReceiver.cpp:151] ERROR: trying to insert existing stream [0x7f2aa80008d0] with sd=231 Dec 21 13:14:32 sbc-dev sems[1060]: [#7f27b74f5700] [addStream, AmRtpReceiver.cpp:151] ERROR: trying to insert existing stream [0x7f28600b3fb0] with sd=1485
please help me with this strange problem