无法处理模块中的自定义运行时错误

我试图处理运行时错误,但编译器说,该运行时错误并没有在此范围内声明。我已经添加了“std”名称空间。包括错误。

In file included from ErrorHandlingModule.cpp:1: ErrorHandlingModule.h:7:25: error: ‘runtime_error’ was not declared in this scope int HandleRuntimeError(runtime_error theRuntimeError); ^~~~~~~~~~~~~ ErrorHandlingModule.cpp:22:54: error: ‘int fpErrorHandling::HandleRuntimeError(std::runtime_error)’ redeclared as different kind of symbol int HandleRuntimeError(runtime_error theRuntimeError){

#include "ErrorHandlingModule.h"
#include <iostream>
#include <exception>

namespace fpErrorHandling{
    using namespace std;

    void Initialize(void){
        cin.exceptions(cin.failbit);
    }

    short int HandleNaN_error(void){
        cerr<<"Input error. Not a number?"<<endl;
        cin.clear();

        char BadInput[5];
        cin>>BadInput;

        return 1;
    }

    int HandleRuntimeError(runtime_error theRuntimeError){
        cerr<<theRuntimeError.what()<<endl;

        return 1;
    }

}

错误处理模块.h:

#ifndef ErrorHandlingModuleH
#define ErrorHandlingModuleH

namespace fpErrorHandling{
    void Initialize(void);
    short int HandleNaN_error(void);
    int HandleRuntimeError(runtime_error theRuntimeError);
}

#endif