I just started getting this error today, havent changed anything. 

[Steam Checks] Error while contacting the SteamAPI. Error: SteamID: 765...356 - Function: GetIsSharedGame - ErrorCode: ParsingFailed.

its a tuesday, steam updates something i think?

Getting the same error

same problem

FunkyNugget

same problem

Just got the same message today, doesnt seem to effect anything (?)

well steamchecks still blocks or let players trough the way i set it up afaik, maybe something to do with familyshare or so, im not sure what is happening

Steam API connect Error

Me also have same message. I check the config file, everthing seems to be ok.