http https redirect issue 301code and not working

Question

I have trouble redirecting http to https!! I'm trying to apply advices but none of them is working.

now I have main domain and sub domains such as example.com / sub1.example.com / sub2.example.com

when I access via https://example.com, It works well but when I type just example.com or www.example.com or http://example.com, it goes 301 code and then load error.html.var

error.html.var is default ErrorDocument on httpd.config However, there is no config for 301 error code but I have no idea loading err.html.var for 301 code

I use httpd.conf / httpd-vhosts.conf / ssl.conf

on httpd-vhosts.conf

 Listen 80
 Listen 443
 
 RewriteEngine  On
 RewriteCond    %{HTTPS} off
 RewriteRule    (.*) https://%{HTTP_HOST}%{REQUEST_URI} [R=301,L]

it goes 301 code and then load error.html.var

so I've tried

 <VirtualHost *:80>
  ServerName example.com
  Redirect permanent / https://example.com/
 </VirtualHost>

 <VirtualHost *:80>
  ServerName sub1.example.com
  Redirect permanent / https://sub1.example.com/
 </VirtualHost>

but it goes 400 bad request that server couldn't understand.

now I don't know what to do......... please give me a advices. Thanks!