http://pastebin.com/dtcLfbaf

Tekkit 3.1.2 Brand new install, no other mods
Terrain control 2.2.4 fresh install default config.

It crash when creating the default files. No biomes config files are created.
But even if you give him default file the same error occurs.

As this is an issue with Tekkit being outdated, I think that this should be closed.

This was fixed in new version

It's just not compatible. You could downgrade to a different version of Tekkit like I did once but It still was quite buggy.

Do you know if its going to be compatible anytime soon ?

2.1.8 work perfectly with Tekkit 3.1.2 (last version) but the last version 2.2.4 crash...

Terrain Control bypasses the Bukkit API on some places and talks directly to the server. It must do this because Bukkit doesn't support a lot of needed functions.

Most of the methods outside the API are obfuscated: they have been renamed to meaningless nanes like a(). The names change almost every Minecraft version, so code written for Minecraft 1.3.1 doesn't work with Minecraft 1.2.5. Tekkit is still at 1.2.5, so you have to downgrade TC to use it with Tekkit.

I hope that the mod API will provide enough hooks to make code like this unnessary.