plowmanplow

Somewhere in the process of extracting and repackaging your modpack archive you have damaged the Millenaire mod's folder structure. You will need to remove all of the files and folders related to Millenaire and re-download/re-install the mod.

The modpack archive has changed, but the version number of your pack has not. The pack version number must be incremented every time you change the modpack archive for the Launcher to be aware of the change and download the update. Your Tinker's Construct mod is quite out of date. You should be using version 1.5.5.7.

Always include the API URL of your custom modpack when requesting assistance. Since the Launcher is having trouble extracting the modpack this will be required in order to figure out what is happening. When I use the contents of the download you provided in my test environment it works correctly.

The Tracker is your friend: http://forums.technicpack.net/tracker/project-8-big-dig/

Don't use Java 8. Use the latest Java 7 for your platform.

No error/Forge logs? Hard to guess what might be happening.

So, here's my recommendation. If you want to use that modpack, you should create your own based on it. That pack is a hot freaking mess. It has a ton of stuff in the bin folder which doesn't belong, and there are no config files. A pack of that size with no configs is a recipe for disaster. The pack has a metric brick-ton of item ID conflicts which will eventually prove to be fatal. All of these need to be resolved with a full compliment of resolved config files to make the pack viable. That being said, I was able to start a server with the following mods removed using both basic Forge and the lastest Cauldron (#205) release: Damage Indicators NEI Addons NEI Plugins Zans Minimap I was able to connect with that client successfully. Keep in mind that I did not fix any of the item ID conflicts so I wouldn't consider that to be a viable server.

Alright, it had been too long. Looks like ConfigMod is required for Weather mod. Stick that back in.

java.lang.NoClassDefFoundError: net/minecraft/client/renderer/EntityRenderer This means that one of two things is happening: You have a client-only mod in your server mods folder. Mods which deal exclusively with how things are rendered on your screen (like AnimatedPlayer or Optifine) are only meant to be used on the client and will not work on the server. Since they have no interaction with the data going between the client and server they can and should be removed on the server. You have a mod on the server which should work fine, but the author is not properly coding things so that the client-only code is protected on the server. The server does not have the code necessary to draw things on the screen (like rendering an entity or changing a GUI element) and if a mod which needs to be on the server but isn't properly protecting the client-only parts (called proxying) it will crash the server. Some mods which look like they are on your server which need to be removed: DamageIndicators ConfigMod (maybe) MobDismemberment NEIAddons NEIPlugins There may be others.

http://forums.technicpack.net/tracker/project-4-attack-of-the-b-team/

There is likely additional information in your latest Forge log in the logs folder. Also, always provide the API URL (the URL you paste into the Launcher to add the pack) when requesting assistance.

You must be doing a decent job of reading through other threads since you included the API URL for your pack. You would not believe how many folks overlook that detail, so, thanks! Your modpack.jar file is named "modpack.jar.jar". Do a Google search for "windows file explorer always show extension" to help prevent this problem in the future. That should get you running.

A good rule of thumb is to not allocate more than 4G or half your RAM to the launcher, whichever is smaller (i.e. if you have 16G of RAM don't allocate 8G). Your task manager reporting 3690 RAM instead of the full 4G is because some of your system memory is reserved for your integrated video card. This is not a problem and you should be safe allocating 2G or RAM to the launcher.

Errors in the logs, especially when the pack starts and works as expected, are not always an issue. Some mods have files in them that Forge does not handle well, or the mod tries to call back to a web site/page which isn't available and an error is generated. Many mods have broken or missing mcmod.info files and Forge will complain about that as well.

@xtremehunter15: Posting in multiple threads for the same problem is considered bad form. Technical problems with the default packs should be in their respective Trackers (top of this page). Make sure you are not using Java 8.

Shall we guess what the error is? Provide crash-reports and we might be able to help you. If this is not for a custom modpack the proper location for assistance is in the Tracker. Make sure you are not using Java 8.

Please provide the API URL (the URL you paste into the launcher to add the pack) and I'll tell you which mods must be removed.

You don't run the launcher JAR directly. You pass the launcher JAR to the java executable as a command line parameter. Reference the previous posts for precise syntax.

Added Forge 1.7.10 #1240.

Yes, you should install all your current Java installations first, then download and install the latest Java 7 64bit from java.com. Do not download Java 8, get Java 7. You change how much memory is allocated in the Launcher by clicking the Settings/Gear icon in the top right of the Launcher.

Try allocating more memory to the Launcher. Looks like you are currently allocating 1G. Up it to 2G minimum.

C:Program FilesJavajre1.8.0_25 Java 8 should be removed. Install the latest version of Java 7 64bit for your platform. Also, don't allocate more than 4G or half your physical RAM to the launcher, whichever is smaller.

Also, the BareBonesPack now includes Forge 1.7.10 #1235 and #1240.

You can always find your own posts by going to your profile page and clicking on Find Content -> Only Topics.

Without logs we can only guess... but you likely need to switch to Java 7 64bit