Failed to Bootstrap - launcher rebuild app

I have updated the URL to After run the ./launcher rebuild app. I got below error message. How to resolve this issue :(.

Errno::ENOENT: No such file or directory @ rb_sysopen - /etc/apache2/sites-available/example.conf
Location of failure: /pups/lib/pups/replace_command.rb:8:in `read'
replace failed with the params {"global"=>true, "filename"=>"/etc/apache2/sites-available/example.conf", "from"=>"proxy_pass;", "to"=>"rewrite ^/(.*)$ /forum/$1 break;\nproxy_pass;\n"}
** FAILED TO BOOTSTRAP ** please scroll up and look for earlier error messages, there may be more than one

Subfolder installs require much more work and configuration than domain/subdomain installs.

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