/vqmod/vqcache/vq2-xxxxx.php
All instances beginning with vq2- is an error generated from the VQMod cache folder which cannot be reproduced within a core installation of Opencart before the installation of Opencart. This error has indication that one of the installed XML file is causing problematic issues for one or many reasons. An easy solution would be to download the VQMod Manager: viewtopic.php?f=183&t=156866&p=611059#p611059 and to either troubleshoot or disable each XML files - one at the time - and refresh the current page where you'd notice the error message - one process after another - until that error message disappears. Once disappeared, clear your vqcache from your vqmod/vqcache folder and system/cache or system/storage/cache folder (excluding the index.html file). Then, reload your site. As a final result, it would, then, be suggested to contact the developer of that specific extension that caused this error message to appear.
/system/modification or system/storage/modification
Developed for Opencart v2.x releases, the system/modification path error message means that one or many of the installed extensions located in the admin - > extensions - > extensions (OCMod):
is causing a problem. Simply uninstall one extension at the time and refresh the affected page where you see the error - one process after another - until that error message disappears. Once disappeared, it would, then, be suggested to contact the developer of that specific extension that caused this error message to appear.
