i getting a error on changing the mobs in world_the_end here is the crash report and biomes in a zip: http://www.mediafire.com/?3h56xf333h98slr
also the console: http://pastebin.com/SKWSV037

There are multiple syntax errors in your config file. For example, in the wasteland biome, the spawnMonsters setting ends with ,]) instead of ]). After a , TC expects another mob group, which it can't find, resulting in an error. Leaving this bug report open, as TC shouldn't crash, it should dosplay an error message.

ok will try thanks

Most likely related to syntax errors, not a bug.