WebRTC: setRemoteDescription throwing error - webrtc

Question

I have been using one of the open-source(Muaz Khan's) library for WebRTC. The following error is thrown in the following line of code :
peer.setRemoteDescription(new RTCSessionDescription(remoteSdp), cb || function() {}, function(error) {
if (!!connection.enableLogs) {
console.error(JSON.stringify(error, null, '\t'), '\n', remoteSdp.type, remoteSdp.sdp);
}
});
Following is the error message:
{}
answer v=0
o=- 1466540501886325415 2 IN IP4 127.0.0.1
s=-
t=0 0
a=group:BUNDLE audio video
a=msid-semantic: WMS
m=audio 9 UDP/TLS/RTP/SAVPF 111 103 104 9 0 8 126
c=IN IP4 0.0.0.0
a=rtcp:9 IN IP4 0.0.0.0
a=ice-ufrag:+Tp2MN9xkz9Zfn8C
a=ice-pwd:aniPn401PK7bAWCIHV63TPhl
a=fingerprint:sha-256 EC:BB:E4:B5:C2:6B:17:29:E4:CF:BD:8E:8A:5E:D1:BB:59:CA:8F:7D:E3:6B:CF:1D:89:DB:0B:17:AC:65:75:F4
a=setup:active
a=mid:audio
b=AS:128
a=extmap:1 urn:ietf:params:rtp-hdrext:ssrc-audio-level
a=extmap:3 http://www.webrtc.org/experiments/rtp-hdrext/abs-send-time
a=recvonly
a=rtcp-mux
a=rtpmap:111 opus/48000/2
a=rtcp-fb:111 transport-cc
a=fmtp:111 minptime=10; useinbandfec=1; stereo=1; sprop-stereo=1; maxaveragebitrate=1048576; maxplaybackrate=1048576; stereo=1; sprop-stereo=1; maxaveragebitrate=1048576; maxplaybackrate=1048576
a=maxptime:3
a=maxptime:3
a=rtpmap:103 ISAC/16000
a=rtpmap:104 ISAC/32000
a=rtpmap:9 G722/8000
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:126 telephone-event/8000
a=maxptime:60
m=video 9 UDP/TLS/RTP/SAVPF 101 100 116 117 96 97 98
c=IN IP4 0.0.0.0
a=rtcp:9 IN IP4 0.0.0.0
a=ice-ufrag:+Tp2MN9xkz9Zfn8C
a=ice-pwd:aniPn401PK7bAWCIHV63TPhl
a=fingerprint:sha-256 EC:BB:E4:B5:C2:6B:17:29:E4:CF:BD:8E:8A:5E:D1:BB:59:CA:8F:7D:E3:6B:CF:1D:89:DB:0B:17:AC:65:75:F4
a=setup:active
a=mid:video
b=AS:512
a=extmap:2 urn:ietf:params:rtp-hdrext:toffset
a=extmap:3 http://www.webrtc.org/experiments/rtp-hdrext/abs-send-time
a=extmap:4 urn:3gpp:video-orientation
a=recvonly
a=rtcp-mux
a=rtpmap:101 VP9/90000
a=rtcp-fb:101 ccm fir
a=rtcp-fb:101 nack
a=rtcp-fb:101 nack pli
a=rtcp-fb:101 goog-remb
a=rtcp-fb:101 transport-cc
a=rtpmap:100 VP8/90000
a=rtcp-fb:100 ccm fir
a=rtcp-fb:100 nack
a=rtcp-fb:100 nack pli
a=rtcp-fb:100 goog-remb
a=rtcp-fb:100 transport-cc
a=rtpmap:116 red/90000
a=rtpmap:117 ulpfec/90000
a=rtpmap:96 rtx/90000
a=fmtp:96 apt=100
a=fmtp:100 x-google-min-bitrate=4194304; x-google-max-bitrate=4194304
a=fmtp:100 x-google-min-bitrate=4194304; x-google-max-bitrate=4194304
a=rtpmap:97 rtx/90000
a=fmtp:97 apt=101
a=rtpmap:98 rtx/90000
a=fmtp:98 apt=116
First of all, is the SDP valid and if it is what could possibly cause the error?