You should not modify core files .. if you would like to donate a cup of coffee I will write it in a modification for you.
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Did you cleared the cache? viewtopic.php?f=134&t=215776#p718325 .
The most generated errors being found on Opencart forum originates from contributed programming. The increased post counters are caused by redundancies of the same solutions that were already provided prior.
Programmer / Opencart Tester