Packet does not have Picture ID in JVB 2.0

JVB2.0 threw a lot of messages as below for a screen sharing.

Vp8Parser.modify#64: Packet RtpPacket: PT=100, Ssrc=491084380, SeqNum=22192, M=false, X=true, Ts=3013268894 does not have picture ID. Packet data: B06456B0 B39AD59E 1D455A5C BEDE0002

Vp8Parser.modify#64: Packet RtpPacket: PT=100, Ssrc=491084380, SeqNum=22193, M=false, X=true, Ts=3013268894 does not have picture ID. Packet data: B06456B1 B39AD59E 1D455A5C BEDE0002

Any idea?

Thanks,

/Kaiduan