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Runtime error refers to an error that takes place while executing a program. As opposed to the compilation errors that occur during a program compilation, runtime errors occur only during the execution of the program. Runtime errors imply bugs in the program or issues that the developers had expected but were unable to correct. For example, insufficient memory can often trigger a runtime error.
Runtime errors usually appear in a message box that includes a specific error code coupled with its corresponding description. It is quite common that the computer becomes noticeably slow prior to the appearance of a runtime error.