Serve missing images from production with Apache & SSL

I’m attempting to get missing images from my production site on a custom Local set up using Apache. I have the following .htacess rule
<IfModule mod_rewrite.c> RewriteEngine On RewriteBase /blog/ #Redirect WordPress uploads RewriteCond %{REQUEST_FILENAME} !-d RewriteCond %{REQUEST_FILENAME} !-f RewriteRule wp-content/uploads/(.*)$$1 [R=302,L,NC] </IfModule>

But it’s generating the following error
No protocol handler was valid for the URL /blog/wp-content/uploads/2018/07/kitten.jpg. If you are using a DSO version of mod_proxy, make sure the proxy submodules are included in the configuration using LoadModule., referer: http://example.local/blog/

How do I correctly include the module(s)?