This issue may be similar to #673 not sure though as it does not crash the server just freezes it when the dimension being built reaches 99% then it simply spams my console with a tonne of errors. The log ended being about 14 megabytes in size by the time i managed to bring the server down by restarting the entire server itself.

Log Can be downloaded from here Server Log

RFtools version 5.1.6
Forge version 2070

RFTools Dimension creation is a different mod. So the version of rftools is not relevant. I need the version of RFTools Dimensions.

However from this part of the log: java.lang.NoClassDefFoundError: net/minecraft/world/World$2
at net.minecraft.world.World.func_180496_d(World.java:525) ~[aid.class:?]
at net.minecraft.world.World.func_175685_c(World.java:470) ~[aid.class:?]
at net.minecraft.world.World.func_175722_b(World.java:423) ~[aid.class:?]
at net.minecraft.world.World.markAndNotifyBlock(World.java:368) ~[aid.class:?]
at net.minecraft.world.World.func_180501_a(World.java:349) ~[aid.class:?]
at net.minecraft.world.World.func_175656_a(World.java:408) ~[aid.class:?]
at team.chisel.common.util.GenerationHandler.replace(GenerationHandler.java:97) ~[GenerationHandler.class:?]
at team.chisel.common.util.GenerationHandler.onLavaLakes(GenerationHandler.java:76) ~[GenerationHandler.class:?]

It appears this is a problem with chisel. Can you report to them?

version 1.10-4.30beta.47

Thank you for taking the time to create this issue, as we're no longer supporting versions below 1.12, I'm going to go ahead and close it but if this bug seems to continue over to newer versions, please do report it again so we can investigate the issue further.