Understanding 'Invalid Tuning' report? "Incorrectly matched tuning types - Expected 'E', got 'T'"

Thanks, that helps explain a lot.

Almost all of these errors come from one mod pack, that hasn't seen an update in a few years - so if I wanted to get rid of those reports I'll have to do it myself most likely.

But now I think I'm understanding what I'm reading more, so thank you for the detailed info.