How do you fix a corrupt mine craft world with the technic pack installed

If its from Technic Launcher you have to delete the launcher and redownload it. If its something you installed to the main minecraft launchers bin then you need to delete the bin file and force update. If this is the case and you are on windows you need to click the windows button and type in the search bar %appdata% and double click it or click on Roaming and go to .minecraft, then you will see a file called "bin". Delete that then launch minecraft and before signing in, click options the click force update, then lauch minecraft and it will work again. Either one of these solutions should fix your minecraft