Ticking exception error

[heyokajan]

Hello,

FTB Launcher version (if this isn't the newest update update and try again): latest​

Minecraft Version: 1.4.6(direwolf20 modpack)​

Java version: java 7 latest version​

Detailed description of the issue / how can the issue be recreated: Today I was paying feed the beast direwolf20 modpack. I was busy setting up my railcraft system so that I can pump lava from nether to the overworld fully automatic with using mystcraft. Everything worked fine but out of the nothing minecraft crashes and gives me an error. I load up again and start playing again and a minute later the same happens. Tried a different new world without placing any block which didn't have the problem. It kept happening ever since I got my railcraft system working. I can play for a minute than it crashes.​

I also did a test remaking my railcraft system in a new world. Whenever I start using mystcraft and railcraft carts together however it seems like the issue comes back. But it is not instant, It takes about a minute.​

Error logs:​

pastebin: http://pastebin.com/ukm3fQdf

thanks in advance for any help on this issue.

 

[Ashzification]

Right now you can't put (railcraft) carts through mystcraft portals. It's broken. Otherwise, for the ticking error, try this:
http://forum.feed-the-beast.com/thr...7-and-direwolf20-v4-modpacks.6913/#post-80257

Also, your Java is not the latest version. The most current version of Java 7 is update 10