The error message is as follows:
[warn] peerconnection:: onfailure() | webtc:: setsessiondescriptionobserver failure [internal]_ ERROR:Failed to set local answer sdp: ]
[ERROR] transport_ wrapper::+TransportWrapper nati veConsume:listener 
p roducerId:kind :rtpP arameters:appData : | Failed to set local answer sdp:
When three or more users make a call, the new users sometimes have this situation
SDP local answer:
[answer:v=0
o=- 1128991414326084706 5 IN IP4 127.0.0.1
s=-
t=0 0
a=msid-semantic: WMS
a=group:BUNDLE 0 1 2 3
m=audio 59309 UDP/TLS/RTP/SAVPF 100
c=IN IP4 192.168.129.200
a=rtpmap:100 opus/48000/2
a=fmtp:100 minptime=10;useinbandfec=1
a=rtcp:9 IN IP4 0.0.0.0
a=extmap:10 urn:ietf:params:rtp-hdrext:ssrc-audio-level
a=extmap:1 urn:ietf:params:rtp-hdrext:sdes:mid
a=setup:active
a=mid:0
a=recvonly
a=ice-ufrag:aZUY
a=ice-pwd:61jwB8DyraFrNiWEOq1WpSjb
a=fingerprint:sha-256 35:C5:CC:9F:D9:7F:66:66:41:01:3C:F4:B5:FC:57:F9:09:13:5A:A0:3F:E4:E3:B3:65:56:58:09:7D:3B:A2:20
a=candidate:732365140 1 udp 2122260223 192.168.129.200 59309 typ host generation 0 network-id 1 network-cost 10
a=candidate:1906641367 1 udp 2122194687 169.254.93.71 52365 typ host generation 0 network-id 2 network-cost 10
a=candidate:2691412823 1 udp 2122131711 2408:8456:815:81d9:1423:da22:f7c0:f569 56397 typ host generation 0 network-id 8 network-cost 900
a=candidate:1087232659 1 udp 2122066175 2408:8556:816:5479:ed46:eedf:5219:6d82 59803 typ host generation 0 network-id 9 network-cost 900
a=candidate:2533633289 1 udp 2121998079 10.242.140.149 58736 typ host generation 0 network-id 7 network-cost 900
a=candidate:253455316 1 udp 2121935103 2408:8556:816:5479:9c:752c:fecf:a953 64006 typ host generation 0 network-id 3 network-cost 50
a=candidate:253455316 1 udp 2121869567 2408:8556:816:5479:9c:752c:fecf:a953 49724 typ host generation 0 network-id 4 network-cost 50
a=ice-options:trickle
a=rtcp-mux
m=audio 9 UDP/TLS/RTP/SAVPF 100
c=IN IP4 0.0.0.0
a=rtpmap:100 opus/48000/2
a=fmtp:100 minptime=10;useinbandfec=1
a=rtcp:9 IN IP4 0.0.0.0
a=extmap:10 urn:ietf:params:rtp-hdrext:ssrc-audio-level
a=extmap:1 urn:ietf:params:rtp-hdrext:sdes:mid
a=setup:active
a=mid:1
a=recvonly
a=ice-ufrag:aZUY
a=ice-pwd:61jwB8DyraFrNiWEOq1WpSjb
a=fingerprint:sha-256 35:C5:CC:9F:D9:7F:66:66:41:01:3C:F4:B5:FC:57:F9:09:13:5A:A0:3F:E4:E3:B3:65:56:58:09:7D:3B:A2:20
a=ice-options:trickle
a=rtcp-mux
m=video 9 UDP/TLS/RTP/SAVPF 101 102
c=IN IP4 0.0.0.0
a=rtpmap:101 VP8/90000
a=rtpmap:102 rtx/90000
a=fmtp:102 apt=101
a=rtcp:9 IN IP4 0.0.0.0
a=rtcp-fb:101 ccm fir
a=rtcp-fb:101 nack pli
a=extmap:12 urn:ietf:params:rtp-hdrext:toffset
a=extmap:4 http://www.webrtc.org/experiments/rtp-hdrext/abs-send-time
a=extmap:11 urn:3gpp:video-orientation
a=extmap:5 http://www.ietf.org/id/draft-holmer-rmcat-transport-wide-cc-extensions-01
a=extmap:6 http://tools.ietf.org/html/draft-ietf-avtext-framemarking-07
a=extmap:1 urn:ietf:params:rtp-hdrext:sdes:mid
a=setup:active
a=mid:2
a=recvonly
a=ice-ufrag:aZUY
a=ice-pwd:61jwB8DyraFrNiWEOq1WpSjb
a=fingerprint:sha-256 35:C5:CC:9F:D9:7F:66:66:41:01:3C:F4:B5:FC:57:F9:09:13:5A:A0:3F:E4:E3:B3:65:56:58:09:7D:3B:A2:20
a=ice-options:trickle
a=rtcp-mux
a=rtcp-rsize
m=video 9 UDP/TLS/RTP/SAVPF 101 102
c=IN IP4 0.0.0.0
a=rtpmap:101 VP8/90000
a=rtpmap:102 rtx/90000
a=fmtp:102 apt=101
a=rtcp:9 IN IP4 0.0.0.0
a=rtcp-fb:101 ccm fir
a=rtcp-fb:101 nack pli
a=extmap:12 urn:ietf:params:rtp-hdrext:toffset
a=extmap:4 http://www.webrtc.org/experiments/rtp-hdrext/abs-send-time
a=extmap:11 urn:3gpp:video-orientation
a=extmap:5 http://www.ietf.org/id/draft-holmer-rmcat-transport-wide-cc-extensions-01
a=extmap:6 http://tools.ietf.org/html/draft-ietf-avtext-framemarking-07
a=extmap:1 urn:ietf:params:rtp-hdrext:sdes:mid
a=setup:active
a=mid:3
a=recvonly
a=ice-ufrag:aZUY
a=ice-pwd:61jwB8DyraFrNiWEOq1WpSjb
a=fingerprint:sha-256 35:C5:CC:9F:D9:7F:66:66:41:01:3C:F4:B5:FC:57:F9:09:13:5A:A0:3F:E4:E3:B3:65:56:58:09:7D:3B:A2:20
a=ice-options:trickle
a=rtcp-mux
a=rtcp-rsize
]
SDP remote offer：
[offer:v=0
o=libmediasoupclient 10000 4 IN IP4 0.0.0.0
s=-
t=0 0
a=ice-lite
a=fingerprint:sha-512 76:F0:2E:3D:FF:C3:2D:CB:F2:CB:AD:DC:B2:3D:65:D0:8E:4D:03:7D:F3:C8:22:10:D4:FA:F2:5B:04:18:5B:17:59:13:56:BD:E3:98:54:61:29:44:E3:A5:D0:45:35:2D:C0:C9:BD:D5:23:69:93:8F:2C:49:5A:B6:05:70:22:DC
a=msid-semantic: WMS *
a=group:BUNDLE 0 1 2 3
m=audio 7 UDP/TLS/RTP/SAVPF 100
c=IN IP4 127.0.0.1
a=rtpmap:100 opus/48000/2
a=fmtp:100 minptime=10;sprop-stereo=1;usedtx=1;useinbandfec=1
a=extmap:1 urn:ietf:params:rtp-hdrext:sdes:mid
a=extmap:4 http://www.webrtc.org/experiments/rtp-hdrext/abs-send-time
a=extmap:10 urn:ietf:params:rtp-hdrext:ssrc-audio-level
a=setup:actpass
a=mid:0
a=sendonly
a=ice-ufrag:m53itro686pm7onz
a=ice-pwd:32srq4pf9v2jot0gkft4vhmgyczcd659
a=candidate:udpcandidate 1 udp 1076302079 192.168.129.121 41739 typ host
a=end-of-candidates
a=ice-options:renomination
a=ssrc:697698393 cname:/i6xWPvpMnsgdA4Q
a=ssrc:697698393 msid:/i6xWPvpMnsgdA4Q 29f7c2a5-06f8-45a1-92d4-9e6c8b7910aa
a=rtcp-mux
a=rtcp-rsize
m=audio 7 UDP/TLS/RTP/SAVPF 100
c=IN IP4 127.0.0.1
a=rtpmap:100 opus/48000/2
a=fmtp:100 minptime=10;useinbandfec=1
a=extmap:1 urn:ietf:params:rtp-hdrext:sdes:mid
a=extmap:4 http://www.webrtc.org/experiments/rtp-hdrext/abs-send-time
a=extmap:10 urn:ietf:params:rtp-hdrext:ssrc-audio-level
a=setup:actpass
a=mid:1
a=sendonly
a=ice-ufrag:m53itro686pm7onz
a=ice-pwd:32srq4pf9v2jot0gkft4vhmgyczcd659
a=candidate:udpcandidate 1 udp 1076302079 192.168.129.121 41739 typ host
a=end-of-candidates
a=ice-options:renomination
a=ssrc:795566665 cname:o10tqoTQ4gx+NX1c
a=ssrc:795566665 msid:o10tqoTQ4gx+NX1c 021ff065-cb0e-47bf-be13-e4171a07101a
a=rtcp-mux
a=rtcp-rsize
m=video 7 UDP/TLS/RTP/SAVPF 101 102
c=IN IP4 127.0.0.1
a=rtpmap:101 VP8/90000
a=rtpmap:102 rtx/90000
a=fmtp:102 apt=101
a=rtcp-fb:101 ccm fir
a=rtcp-fb:101 nack pli
a=extmap:1 urn:ietf:params:rtp-hdrext:sdes:mid
a=extmap:4 http://www.webrtc.org/experiments/rtp-hdrext/abs-send-time
a=extmap:5 http://www.ietf.org/id/draft-holmer-rmcat-transport-wide-cc-extensions-01
a=extmap:6 http://tools.ietf.org/html/draft-ietf-avtext-framemarking-07
a=extmap:11 urn:3gpp:video-orientation
a=extmap:12 urn:ietf:params:rtp-hdrext:toffset
a=setup:actpass
a=mid:2
a=sendonly
a=ice-ufrag:m53itro686pm7onz
a=ice-pwd:32srq4pf9v2jot0gkft4vhmgyczcd659
a=candidate:udpcandidate 1 udp 1076302079 192.168.129.121 41739 typ host
a=end-of-candidates
a=ice-options:renomination
a=ssrc:407380313 cname:/i6xWPvpMnsgdA4Q
a=ssrc:407380313 msid:/i6xWPvpMnsgdA4Q ffffb014-872a-4d24-aa0a-5bd692f729f7
a=ssrc:698318148 cname:/i6xWPvpMnsgdA4Q
a=ssrc:698318148 msid:/i6xWPvpMnsgdA4Q ffffb014-872a-4d24-aa0a-5bd692f729f7
a=ssrc-group:FID 407380313 698318148
a=rtcp-mux
a=rtcp-rsize
m=video 7 UDP/TLS/RTP/SAVPF 101 102
c=IN IP4 127.0.0.1
a=rtpmap:101 VP8/90000
a=rtpmap:102 rtx/90000
a=fmtp:101 x-google-start-bitrate=1000
a=fmtp:102 apt=101
a=rtcp-fb:101 ccm fir
a=rtcp-fb:101 nack pli
a=extmap:1 urn:ietf:params:rtp-hdrext:sdes:mid
a=extmap:4 http://www.webrtc.org/experiments/rtp-hdrext/abs-send-time
a=extmap:5 http://www.ietf.org/id/draft-holmer-rmcat-transport-wide-cc-extensions-01
a=extmap:6 http://tools.ietf.org/html/draft-ietf-avtext-framemarking-07
a=extmap:11 urn:3gpp:video-orientation
a=extmap:12 urn:ietf:params:rtp-hdrext:toffset
a=setup:actpass
a=mid:3
a=sendonly
a=ice-ufrag:m53itro686pm7onz
a=ice-pwd:32srq4pf9v2jot0gkft4vhmgyczcd659
a=candidate:udpcandidate 1 udp 1076302079 192.168.129.121 41739 typ host
a=end-of-candidates
a=ice-options:renomination
a=ssrc:669941607 cname:o10tqoTQ4gx+NX1c
a=ssrc:669941607 msid:o10tqoTQ4gx+NX1c 82db6703-d292-49ff-9e95-61a599e3a589
a=ssrc:240014770 cname:o10tqoTQ4gx+NX1c
a=ssrc:240014770 msid:o10tqoTQ4gx+NX1c 82db6703-d292-49ff-9e95-61a599e3a589
a=ssrc-group:FID 669941607 240014770
a=rtcp-mux
a=rtcp-rsize
]