Seriously Annoying Crashing

[HalestormXV]

So all of my players seem to be experiencing the same crash and I cannot for the life of me figure out what it is. I would really apprecaite any help I could get. Here is one of the crash reports. Generally they are all the same error:

http://pastebin.com/NJmUhcJP

[plowmanplow]

• You don't specify whether this is a client or server crash. I'm seeing things that make me think it's a server crash report, but seeing mods in the list which don't belong on a server.
• Always provide the API URL or a link to the pack details page when requesting custom modpack (or server) assistance.
• Assuming you are using Cauldron (or derivative), have you tried just Forge? Does the error happen there as well?
• Which specific version of the server process are you using?
• I see FastCraft in that list of mods. FastCraft and Cauldron are incompatible.

Please provide more details.

[HalestormXV]

Its a client side error. It seems like it was related to ExtraUtils or Mariculture. That issue has been resolved by taking both of those mods out.

 

Now the next crash my users are getting is the dreaded Connection Reset by Peer one. Any ideas on how to resolve that? My users get "Internal Error" and then I look at the log and it is always a Connection Reset by Peer: Internal Exception: java.io.IOException: Connection reset by peer (to be precise) The server remain up and running but the client crashes. This is a hard one to track down. Multiple users are experiencing this however I have only received one crash report and that is this: http://www.pastebin.com/j6AtQw3H

The server is running cauldron 1381 and no fastcraft is not installed on it.

 

API Link: http://api.technicpack.net/modpack/nsp-fairytail

 

Asfor why that link is providing a request unauthorized 401 I have no idea. Perhaps the API is down at the time of this post. But  I am able to download he modpack just fine. Here is the link to the pack itself: http://www.technicpack.net/modpack/nsp-fairytail.654111

Edited June 8, 2015 by HalestormXV

[Cerandior]

OpenModsLib crash transformers
This was a line that i can't really undesrtand, but try removing the OpenMods, like openblocks ...
I am not really sure if that's the case, but something else you have to make sure is that the CoreMods (example: CodeChickenCore,Aroma1997Core) are the newest versions. What i mean is that you cannot run a new version of the mod with the older version of the library files. By the way, do you get the error or just they?
Make sure you give them your exact copy of "mods" folder in your minecraft folder. One last thing is to remove MagriCulture. These are the only suggestions that i can make you. If none of these works then i am sorry but i cannot really help you.