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I am working on a map in world painter and I have been working with it/ exporting for weeks now and when I exported it and went to test it today it just locks up and it crashes the size is around 400mb im currently uploading it to my multiplayer server to test it but thats taking hours through FTP..

--- Minecraft Crash Report ----
// I let you down. Sorry

Time: 25/12/12 19:11
Description: Exception while updating neighbours

java.lang.StackOverflowError
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$100(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)