Its an error in a C++ pure virtual function (sorry for stating the obvious). In C++ virtual functions ensure that the correct function is called for an object. Pure virtual functions however are used to define an abstract class (or an expression of a general concept) which can then be used to derive more specific classes.
You cannot directly create an object of an abstract class type, however you can use references and pointers to the original abstract class type which can lead to trouble.
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