While I don't know anything about the simulation site, the error message seems to indicate the simulation can't yet handle something you are doing (perhaps the analog stuff which I assume is reading the ldrs?). I do notice that aref is still disconnected which may disable analog reading (as it will in real life, without a reference voltage I don't think the a/d will work). You might try connecting 5 volts to aref and see if that makes it happier.
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