错误C2664：MessageBoxW无法将参数2从'const char'转换为'LPCWSTR'

我不断收到此错误消息：

状态错误C2664-int MessageBoxW（HWND，LPCWSTR，LPCWSTR，UINT）'：无法将参数2从'const char *'转换为'LPCWSTR'“ 31

这是我的下面的代码。我知道这与通过what()错误类中的函数传递const类型有关。由于某种原因，它是不兼容的。有任何想法吗？

// on startup execute to determine exceptions
try
{
    // instantiate object app of class AppWindow
    AppWindow app;

    // if(initialize function in class app is executed, and while the app is running, broadcast app)
    if (app.init())
    {
        while (app.isRun())
        {
            app.broadcast();
        }
    }
}

// if the following error is found, execute MessageBox function with following parameters
catch (const std::runtime_error& error)
{
    // parameters(has no owner window so displays independently)
    MessageBox(nullptr,  error.what(), L"An error has occured", MB_OK);
}

return 0;