Hi again, sorry for asking so many times about stuff.
Based on Markyjoe's Tiled Tutorial (http://markyjoe.com/Tutorials/Tiled_Tutorial/Tutorial.html), I learned to create basic maps and inserting them without tile changes. But the problem comes when I try to insert the tile changes.
I've written the properties manually, the map size is 16x10 squares (same size as the first prologue chapter), and quite a bit of errors show up, including this one from the pic and others with the ID, though I think I solved the ID issues. Still trying to figure out, but if anyone happens to know, it would help a lot.
I don't think I need knowledge from event hacking on this yet; I'm still learning about that on Arch's post, and the Tutorial doesn't mention anything about event hacking. I'm not sure about what kind of object reference the error message is mentioning... Sorry for the trouble again if you decide to help, I'll update the situation if I find a solution myself.
(I highlighted the most important part of the blog because I felt it was kinda ranty-ish and I just wanted to show the point)