Ugdhar

if(world.isRemote){ Not sure if you actually want to run this on the client, clients could lie about what advancements are completed, and/or won't be in sync with the server advancements. Of course playing a sound would definitely occur on the client, but logic checks should probably be done server-side. Beyond that, I haven't tried doing this myself, so I am unsure how to go about it. If I have some time to tinker I might check it out and if I find out anything, I'll come back and post.

I use Eclipse (2019-12), and I am able to run/debug my project within the IDE without having to manually run gradlew tasks. How did you setup your project? I know you can import the gradle project into the IDE and run the tasks from there, but I still do things from the commandline, because I'm old, so I just ran gradlew eclipse and gradlew genEclipseRuns in my mod project folder to get things setup (I actually, for whatever unknown reason, have to run them twice to get the MC/Forge sources to attach in the IDE properly, no idea why or how, but running once, I don't get sources, if I run them twice, I have sources lol). Not sure how you do it, or if a difference in project setup would even cause that to happen.

Advancements are just json files in data/MODID/advancements in your resources. Check out vanilla advancements to see how they work things. Also, the minecraft wiki page on the advancements json format is helpful: https://minecraft.gamepedia.com/Advancements/JSON_format Hope this helps! Try making some simple ones, and if you have trouble, post logs/code/json (or logs, and a link to a github would be better), and I'm sure someone will give you a hand.

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This is a message board, not a chat room, so there are not always people watching, sometimes it can take a while to get a reply. That being said, 1.12 is no longer supported here on these forums, due to how old it is. Please update to a modern version to receive support. More information on supported versions can be found in the LTS link at the top of every page.

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Please post full logs as described in the EAQ, there is not enough information in your post to help.

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Please be more specific about what you are trying to achieve, details from the players point of view would help

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Unfortunately, not something I've messed with yet, so I can't help you. I was just explaining how (I'm guessing) the other person was figuring it was server side..

Not sure if this is 100% correct, but unless something is graphics, sound, or input, I would pretty much guess that it's server-side, otherwise the client could corrupt/hack stuff.

First, I'm pretty sure you are not supposed to rehost mods like you are doing on your google drive. Second, 1.7 is no longer supported on these forums due to being so old. Please update to a modern version to receive support here. More information on supported versions can be found in the LTS link at the top of every page.

Whats Line? Not sure if that's the line number or not where it says "SourceFile:62", but again, probably would want to look at the debug log, not just the crashlog (I know this is old, but if it were new that's what you'd want to do) for more info, as it may be crashing in that method in AgeableModel, but it's more than likely not CAUSED by the AgeableModel.

So this is how I am reading that log you linked: 1. I notice it's a Null Pointer Exception (NPE), so something that's null is being accessed 2. Not much more information at the top here, just a list of classes where it errored out, but I don't believe that it was the actual AgeableModel that is crashing us, so I continue scrolling/scanning the log 3. Further down, we see some stuff about a unicorn, so to me, that's where I'd be looking. Of course, you only posted the crash log, no debug, so info is limited, and no code to go with the crash. But basically, scan through it (you have to be patient, and actually LOOK at everything, at least a little) and look for stuff that is: A) understandable, i.e. looking for "exception caused by" or something like that; B) any class/package names that are from your project, as these are most likely to cause the issues. Honestly, it's really just programming experience and practice that make a programmer able to debug their stuff. The more you are exposed to it, the more you will understand. Something confusing now, if you keep with it, and continue to learn/grow, in a month you'll look at the same confusing thing and find it much easier to understand. If you find something too hard, back off a bit, work with something a little easier, then come back to it later with a clear mind and maybe a little more knowledge.

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It's one of the gradle tasks

What happens when you try to run the installer for newer versions? Be as detailed as possible.

If you read the error report, it tells you exactly what is wrong: You have 1.14.4 mods trying to load in 1.15.2

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Optifine's website, the download page, there's a changelog link next to every version download, and the changelog will tell you which version of forge that version of optifine will work with.