LexManos

One of the mods you have installed and yes you have one SOMEWHERE. Is registering a nullcleanup and kill your mods folder and try again. texture.

Don't give a crap about your story you're launching the game wrong so techially we shouldn't be supporting you however if you actually want support post EXACTLY WHAT YOU'RE DOING code videos screenshots shit that's actually helpful.

Screen shots of exactly what you're doing.

Just use the instgaller if you can't apply logic to figure things out.

Code Logs Videos SOMETHING that actually tells us shit. There is always a way to get ARLEAST the console log. Get it and post it. its you launching the game wrong we can't really fix something on our end in shit we don't know anything about or have anything to do with.

If inv tweaks goes in the jar its there problem which is what it sounds like.

Looks like you're missing the .jar in the file name -.-

Ya that's not the one you're running looks like you're fucking up trying to change the work dir check the .minecaft folder. Eiither way there is alwats the console log you can get by running the game with java instead of javaw

The file IS created its ALWAYS created even if for some fucked up reason its not then the console log in the launcher is what we need. Either way this is pretty explicit there is a mod that requires 1.6. The log file contains exactly which.

Logs

If you install forge to a differnt directory. You need to tell the launcher to use that folder. If you don't know how to do that then just use the default settings.

People remember ALWAYS ALWAYS ALWAYS GIVE US LOGS. The console is spammed with a crapload of output for a reason we need that info to help you!

Its the same server.

Ya you're not gunna see a forge class in vanilla minecraft but yes it exists so we will not be adding a hook as it already exists.

proper fix is to update forge.

Proper solution is just to update forge.

Update forge above 789

The installer installs the universal for you typically now the universal download is for server admins who want to quickly swap versions.

There are instructions out there on how to copy the version folder and edit the jar. Think of the version folder as the old bin folder with some extra stff. After I get home I was gunna take a look into making a 1.5.2 installer but remember we don't officially support older versions

I was thinking that but the other option is to use the pack.mcmetas setup for defining languages

make a backup of your world then hit the 'continue' button depending on what's changed and if you've used them just loading the would may be fine. However if you used those items you'll have to reconfigure your modpack to make the ids sync up. This is done to prevent you from destroying your world if say you change the id railcraft uses for all of its blocks. There is no true way to fix this as its a per case thing however the main recomendation is to edit your mld configs to realign your ids. And add the mods back if you removed that mod unless you KNOW that you didn't use anything from that mod in the world.

Profiles have a gameDir option for a reason.

Your configs are not in sync between the client and server. Check out which mods are in those id ranges.

Consdiering you're in the wrong package... Im not sure what you're trying to show with that screen shot. Also, showing the ERROR in eclipse *might* be helpful as errors usually mean something is wrong -.- And who cares how long it takes? Click it, let it run, go take a piss come back its done.

Installing is 1 click, just do it. There is no log file. And that class DOES exist. So you should be doing something wrong.