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"Segmentation fault (core dumped)" is an error message that occurs when a program tries to access a memory location that it is not allowed to access. In the context of object-oriented programming in C++, this error message may occur when a program tries to access an object or a member of an object that does not exist, or when it tries to read or write to a memory location that has been deleted or has not been allocated. This error can be caused by a variety of issues, including programming errors, hardware problems, and operating system issues. It is an indication of a serious problem in the program and should be fixed as soon as possible.