JaariAtmc

You need to use an older version of Java. Some quick testing shows that Java 8u51 works, atleast. If you play the modpack itself and have Mojang Java Runtimes enabled, this version is used as well.

One is to make sure to play on java 8, the other is that your mouse might actually be incompatible with this version of minecraft, funny as that may sound.

So instead of "reinstalling", you really just had to close the launcher and open it again. Was an issue with an update to the launcher, which was fixed, and just required reopening the launcher to apply that fix.

Close launcher and reopen launcher.

Where did you copy paste the text from? 1.3 was released so long ago, it entered high school.

And it has absolutely nothing to do with the file and everything with you playing an old minecraft version (<1.8) on a more recent Intel cpu. We have an explanation of this over at the Technic Support discord.

You need to have set up an username for your java account AND make ABSOLUTELY sure you are using the right email. We've already had people swear up and down that they were using the correct one, yet then it turned out they were, in fact, not using the right email.

Please make sure that you have set a username on the vanilla mojang launcher (Account button at the top -> Manage Minecraft: Java Edition Profile -> In opened window, choose Profile Name and set a name if you didn't already). If you have that, make 300% or 400% sure you are ACTUALLY using the right email. We've already had people swear up and down they were using the right email, only to find out they were, in fact, not using the right email.

And your modpack is?

You still need to install java 8 to run the launcher.

It probably tried to run on java 8, while Minecraft 1.20+ requires Java 21 or something.

Make ABSOLUTELY SURE, like REALLY, REALLY, REAAAAALLLY sure you are using the right email. Secondly, make sure you've set a username in the vanilla launcher.

This particular one had absolutely nothing to do with Jurassicraft, because this one had to do with MoarCarts and seemingly its compatibility with Minefactory Reloaded. Yes, nowadays it's most likely going to be LLibrary and Jurassicraft, but don't reply to 5 year old threads attempting to provide help on something you yourself said you have no clue about.

Private paste.

It's something stupid. You put the bin/mods/config in a folder, then zipped that folder. You have to select the bin/mods/config -> Add to zip instead. Right now, there will be a lovely "modpack" folder in your modpack's folder, which contains your 'missing' folders.