Thing is, I've posted this question on there twice, in two different boards since I wasn't sure whether it was an extension or a template error, yet I have not gotten any responses on either topic.
I did enable Legacy Mode before adding older templates and extensions, yet I still receive the error for some reason.
I don't really know what's causing the problem.
Is there anyway to just start from scratch, importing all of my Joomla articles and such to a "refreshed" version of Joomla?
As for why you might not have gotten responses on the Joomla support forum: It is possible that the question has been answered several hundred times already. I assumed you would read any try the previous soltions before posting a question. You probably did, so I don't know what else to say about the Joomla forums except I am a little dissapointed.
Before you do the re-install, here is a thought: How about switching just the template back to the original Joomla template, if you haven't already done this?
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