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copied!<p>The simplest code I can come up with to reproduce this error looks like this:</p> <pre><code>#include <list> int main() { std::list<int> mylist; mylist.pop_front(); } </code></pre> <p>I can prevent the error by doing:</p> <pre><code>#include <list> int main() { std::list<int> mylist; if (!mylist.empty()) { mylist.pop_front(); } } </code></pre> <p>You're calling:</p> <pre><code>myList.pop_front(); </code></pre> <p>...within a <code>while</code>-loop, which in turn is within a <code>while</code>-loop that also calls <code>myList.pop_front()</code>.</p> <p>I can only suggest that you debug your code to see how many times <code>pop_front()</code> is invoked for <code>mylist</code>. My money is on it being more than <code>mylist.size()</code> times, <a href="https://stackoverflow.com/q/19546982/78845#comment29003927_19546982">hence my question in the comments</a> (with new emphasis):</p> <blockquote> <p>How many items are in <code>myList</code> <strong><em>when the error is thrown</em></strong>?</p> </blockquote> <p>Perhaps the simplest fix will be to replace...</p> <pre><code> //Check if there is any item to add to queue while(myList.front().arrival < curr_time) { wt_list.push_back(myList.front()); myList.pop_front(); //Error is coming from this line } while(wt_list.size()>0) { } </code></pre> <p>...with...</p> <pre><code> while (!mylist.empty() && myList.front().arrival < curr_time) { wt_list.push_back(myList.front()); myList.pop_front(); } while (!wt_list.empty()) { } </code></pre> <p>...but it's hard to tell from the snippet you've provided.</p>

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