Enigma

refer to my post here: http://forums.technicpack.net/index.php/topic,1818.msg11946.html#msg11946

Could be a few reasons, do you have any error logs??? What OS are you using?? Have you got the correct and current java installed on your machine?

for the server: find the file modloader.cfg (in the config folder) and change the line mod_NotEnoughItems=on to mod_NotEnoughItems=off for your single player: when opening the launcher at the bottom is a button named "mod select" pressing this will open the modloader.cfg, do the same as above. note: this will not remove NEI but switch it off.

are you using the tekkit option in the launcher? if yes and this crash happens try deleting the technic launcher folder and re-downloading the files.

Just a thought but do you have jvm 32 installed or just the 64 version?

that sounds like a config error or if you are using a world created in 1.1.4 you might want to update it using the world updater found on the tekkit download page. you could always make a backup of your current world and then create a new one and see if that fixes it. also make sure you are using the correct tekkit 2.0 package and try running it locally and see if it works. if it does and you have done everything correctly it could be a java problem.

just a thought but you might want to update your java or install jvm 32 and 64 if you don't already have it, or you could d/l java 7 and see if that works.

Ok First depending on your server host you need to find the root directory. This is usually the area that contains the "minecraft_server.jar" file along with but not always the folders "mod", "plugins", etc. extract the tekkit 2.0 archive to a folder on your PC and edit the server.properties file (using notepad or a word editor) to your liking. Make sure your server is off and not running, depending on your host there will usually be an option to stop your server. Now ftp to the server and copy all the files excluding the launch.bat file to your minecraft root. with some hosts you will need to rename the "tekkit.jar" file to "minecraft_server.jar" or to whatever they have called the server .jar file. in some cases you might not want to copy the server.properties file over as this will change your setting and instead use the one already on the server (might need a little editing). once all the files have been copied and you have configured to your liking, start the server and all the necessary files will be created and you should be good to go. you might also want to reset your world so that all the new blocks can be added. You can usually find the option on most hosts to reset the world but if not you can stop the server, delete the world folder and restart your server which should generate a new world. hope this helps.