[3.1.3 Reported issues and possible fixes]

@Windycloud

There should be a zip file in your mods folder called nether ores and another one called advanced machines or something like that.

Delete those and your server will work.

If you want your advanced machines, then replace the api files like Tekkitopotamus said and keep the advanced machines file.

Pretty sure that'll get your server working.

Yeah, also @prolo, I fixed it so it doesn't really matter.

[3.1.3 Reported issues and possible fixes]

I've tried Tekkitopotamus's solution and the other one with replacing the api files with the ones from tekkit 3.1.2 but my rotary macerator and other advanced machines still don't work anything else I can try?

Edit: Nevermind, I think I have it