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vpss error

Hi, we use RDK4.0, DM8168.

The console constantly prints the error information as following:

[m3vpss ] 276359:ERR::linkID:20000036::channelID:-1::errorCode:-3::FileName:links_m3vpss/avsync/avsync_m3vpss.c::linuNum:1236::errorCondition:((avsync_map_linkid2displayid(pObj,cp->syncLinkID) != AVSYNC_INVALID_DISPLAY_ID) || (cp->displayID != AVSYNC_INVALID_DISPLAY_ID))

How can I resolve?