Are those literal quotation marks in your file path
Or are you just using that to indicate your website name normally goes there? If the former, I'd consider not doing that as it's pretty weird to have quotes in unix file names, and you may run into problems based on assumptions other people have made.
Regardless -- you have the information you need
[RuntimeException] Error Output: PHP Warning: require(/home/admin/web/"webpage"/public_html/test/app/Http/helpers.php): failed to open stream: N o such file or directory in /home/admin/web/"webpage"/public_html/test/vendor/composer/autoload_real.php
PHP is telling you it tried to require in a specific file
but it could not find it ("failed to open stream"). This means either the file doesn't exist on the computer you're trying to load it from, or PHP can't see it for some reason (try dumping the results of
is_readable('/home/admin/web/"webpage"/public_html/test/app/Http/helpers.php'); to see if PHP thinks it can read the file or not.