PHP Fatal Error: require_once(): vc-functions.php

Hello.

I’m testing my website to launch and found on the error_log file several errors pointing to the same source:

[24-Jul-2015 18:44:30 America/Sao_Paulo] PHP Fatal error: require_once(): Failed opening required ‘/assets/backend/vc_extend/helpers/vc-functions.php’ (include_path=’.:/usr/lib/php:/usr/local/lib/php’) in /home/xxxxxx/public_html/cms/wp-content/plugins/ishyoboy-boldial-assets/ishyoboy-shortcodes/ishyoboy-shortcodes.php on line 962

The only particularity of my WP installation is that it is not in the root folder. Instead it is installed on the “cms” folder. Is that a problem?

What went wrong?

Thanks in advance.