You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: app_default_windows.go
    path of file: ./repos/wails/v2/internal/app
    
    the code of the file until where you have to start completion: //go:build !dev && !production && !bindings && windows

package app

import (
	"os/exec"

	"github.com/wailsapp/wails/v2/internal/frontend/desktop/windows/winc/w32"
	"github.com/wailsapp/wails/v2/pkg/options"
)

func (a *App) Run() error {
	return n
    
func CreateApp(_ *options.App) (*App, error) {
	result := w32.MessageBox(0,
		`Wails applications will not build without the correct build tags. 
Please use "wails build" or press "OK" to open the documentation on how to use "go build"`,
		"Error",
		w32.MB_ICONERROR|w32.MB_OKCANCEL)
	if result == 1 {
		exec.Command("rundll32", "url.dll,FileProtocolHandler", "https://wails.io/docs/guides/manual-builds").Start()
	}
	return nil, nil
}