Board Thread:Questions and Answers/@comment-173.79.190.122-20130718015233/@comment-1757231-20130721121541

173.79.190.122 wrote: also, im not really good with that so really how would i fix it??? i had a tekkit lite but its not as good so i want a classic world so i hsve everything Wait! You loaded a Tekkit Lite world on Tekkit Classic! You realise that they run different server systems, different mods, EVERYTHING is different! If you did that, no wonder MC is crashing. It's probably the Cocoa Beans. You probably have to remake your entire world, as the mods largely differ. Sorry mate!

If I misread your post and you aren't loading a Tekkit Lite world on Tekkit Classic, I'll give a more detailed explanation on everything I just wrote: (provided you're on a Windows.)

1. NEI was installed incorrectly. This means that your modpack was installed incorrectly. Backup your saves (the saves folder in your .tekkit folder in the appdata folder), then delete the whole .tekkit folder, redownload, and drag your saves back in.

2. If you're on your own homemade server, playing the on the same computer you use to host it doesn't work. Though, it's evident that you aren't, so disregard this option.

3. Press ESC, go to Options > Controls, and check what your Inventory Key is. Then, exit the menu, press inventory, and check whether or not your NEI shows up on this key: (default is E).

4. Double Item IDs. This shouldn't happen given the circumstances.