Re: [CC and Milestones, error code 110-578ef827] Stuck On Loading Screen Sims 4

@ghosthecker  Please go into Documents > Electronic Arts > The Sims 4 and delete any lastexception file you see.  (It's important to get rid of all of them because they'll hold stale data.)  Try again to load this lot, which will hopefully generate a fresh LE.  You can attach it to a reply here if you delete the file's first line.