unable to find numeric literal operator ‘operator""n’

This error message typically occurs when you are trying to use the C++11 user-defined literal operator "operator""n" in your code, but your compiler does not support it.

To resolve this error, you can try updating your compiler to a version that supports C++11 features, or you can avoid using the "operator""n" literal suffix in your code. Alternatively, you can define your own user-defined literal operator that provides the same functionality as "operator""n".