As I said -any- instance of Darius appearing. It doesn't matter which route it's in. I had messed up some of his code.
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Just click ignore, keep doing it till the error goes away. It only appears on day 4 for Harold and goes away after a few clicks. It was just a simple Who says what is error. Darius is not frequent in the instances where these happen so its easily avoided. They will be fixed in the next update. You're not missing any unseen content. Hope this helped you!