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You have multiple versions of java installed. Remove all of them then reboot. Now install the latest x64 one from below and reboot again.
http://www.oracle.com/technetwork/java/javase/downloads/jre7-downloads-1880261.html
Your java flags have conflicting information. Delete the entry in bold below and try it again.
JVM Flags: 4 total; -Xms256M -Xmx3072M -XX:PermSize=256m -Xmx512M
Update the pack to 1.0.14 it is a problem with the hats mod. Don't use an exisitng world create a new one. If you never use the hats mod you could always disable it.
Can your friend move you from the location you are trying to spawn into. The error is related to, I believe, chicken chunks. If you have a chunk loader in the area it maybe causing it.