I have been experiencing this error for about a whole day now. I first experienced this after I pasted a custom campaign in the Program Files(x86)\Starcraft 2\maps, but I have already deleted it. I can still play offline, but I have also noticed that I cannot play ranked or melee maps on the custom section because they do not load. For troubleshooting, I have tried scan and repair via the battle.net app, cleared the cache from starcraft 2 and battle.net in %appdata%, %localappdata%, and %programdata%, and flushed my DNS. I am seeking technical support as to why or how I can fix this. A swift reply is much appreciated!