[Help] html not loaded

FiveM Resource Development & Modding Discussion
1

hi everyone. i have a project to make menu based html. i following guide [How-To] Use NUI (UI Creation with HTML)
but the html is not be loaded without any error message. i try to open the html in my browser and is working without problem.
i dont know what happen. another resource with html UI is working properly. but not for me

here code in __resource.lua

ui_page 'ui/UI.html'

files{
    'ui/UI.html',
    'ui/style.css',
    'ui/script.js'
}

all location file is correct.