Everything Tekkit removed from Tekkit, Help!!!

[thehappyguy]

Title: Everything Tekkit removed from Tekkit - It's all vanilla!, Help!!!

Version: 3.1.2

OS: Windows 7

Java Version: 1.6.0_29

Description of Problem:

I tried to get voltz, it said update failed, i did'nt think this would affect anything else, but when i logged on to my tekkit world the walls of my house had gone, I did'nt understand why,so i looked around, my walls were made of marble. I then noticed that NEI had gone, then i realsised that everything in my inventory was vanilla. Could anybody explain why this has happened and how i fix it? I have tried logging on and off, and looking on different worlds.

Error Messages:

Error Log:

[An Hero]

Check your .techniclauncher folder to see if anything is wrong in there. I've had problems with updates in Voltz before. Best thing to do is go into manual build selection and pick the build below the one it's currently using. If that doesn't restore the blocks then they might be lost forever.