[18:49:12] [Server thread/INFO]: [WorldBorder] Enabling WorldBorder v1.7.6
[18:49:12] [Server thread/INFO]: [WorldBorder] [CONFIG] Using rectangular/square border, knockback of 3.0 blocks, and timer delay of 5.
[18:49:12] [Server thread/INFO]: [WorldBorder] [CONFIG] Border-checking timed task started.
[18:49:12] [Server thread/INFO]: [WorldBorder] [CONFIG] World "RP" has border radius 3000 at X: 0.0 Z: 0.0
...
[18:49:35] [Server thread/INFO]: World generation task is ready for world "RP", padding the map out to 208 blocks beyond the border (default 208), and the task will try to generate up to 20 chunks per second (default 20). Parts of the world which are already fully generated will be skipped.
[18:49:35] [Server thread/INFO]: This process can take a very long time depending on the world's border size. Also, depending on the chunk processing rate, players will likely experience severe lag for the duration.
...
[18:49:40] [Server thread/INFO]: WorldBorder map generation for world "RP" task started.
...
[18:53:22] [Server thread/INFO]: [WorldBorder] [Fill] 101 more chunks processed (4735 total, ~2.9%) (free mem: 710 MB)
[18:53:26] [Server thread/WARN]: [WorldBorder] Task #4 for WorldBorder v1.7.6 generated an exception
java.lang.NoSuchMethodError: net.minecraft.server.v1_7_R1.WorldGenPackedIce2.setType(Lnet/minecraft/server/v1_7_R1/World;IIILnet/minecraft/server/v1_7_R1/Block;)V
    at net.minecraft.server.v1_7_R1.WorldGenPackedIce2.a(SourceFile:49) ~[craftbukkit.jar:git-Bukkit-1.6.4-R2.0-9-g68d0e57-b2930jnks]
    at net.minecraft.server.v1_7_R1.BiomeIcePlains.a(SourceFile:33) ~[craftbukkit.jar:git-Bukkit-1.6.4-R2.0-9-g68d0e57-b2930jnks]
    at net.minecraft.server.v1_7_R1.ChunkProviderGenerate.getChunkAt(SourceFile:432) ~[craftbukkit.jar:git-Bukkit-1.6.4-R2.0-9-g68d0e57-b2930jnks]
    at org.bukkit.craftbukkit.v1_7_R1.generator.NormalChunkGenerator.getChunkAt(NormalChunkGenerator.java:49) ~[craftbukkit.jar:git-Bukkit-1.6.4-R2.0-9-g68d0e57-b2930jnks]
    at net.minecraft.server.v1_7_R1.ChunkProviderServer.getChunkAt(ChunkProviderServer.java:228) ~[craftbukkit.jar:git-Bukkit-1.6.4-R2.0-9-g68d0e57-b2930jnks]
    at org.bukkit.craftbukkit.v1_7_R1.CraftWorld.chunkLoadPostProcess(CraftWorld.java:271) ~[craftbukkit.jar:git-Bukkit-1.6.4-R2.0-9-g68d0e57-b2930jnks]
    at org.bukkit.craftbukkit.v1_7_R1.CraftWorld.loadChunk(CraftWorld.java:251) ~[craftbukkit.jar:git-Bukkit-1.6.4-R2.0-9-g68d0e57-b2930jnks]
    at com.wimbli.WorldBorder.WorldFillTask.run(WorldFillTask.java:204) ~[?:?]
    at org.bukkit.craftbukkit.v1_7_R1.scheduler.CraftTask.run(CraftTask.java:53) ~[craftbukkit.jar:git-Bukkit-1.6.4-R2.0-9-g68d0e57-b2930jnks]
    at org.bukkit.craftbukkit.v1_7_R1.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:345) [craftbukkit.jar:git-Bukkit-1.6.4-R2.0-9-g68d0e57-b2930jnks]
    at net.minecraft.server.v1_7_R1.MinecraftServer.u(MinecraftServer.java:577) [craftbukkit.jar:git-Bukkit-1.6.4-R2.0-9-g68d0e57-b2930jnks]
    at net.minecraft.server.v1_7_R1.DedicatedServer.u(DedicatedServer.java:250) [craftbukkit.jar:git-Bukkit-1.6.4-R2.0-9-g68d0e57-b2930jnks]
    at net.minecraft.server.v1_7_R1.MinecraftServer.t(MinecraftServer.java:535) [craftbukkit.jar:git-Bukkit-1.6.4-R2.0-9-g68d0e57-b2930jnks]
    at net.minecraft.server.v1_7_R1.MinecraftServer.run(MinecraftServer.java:447) [craftbukkit.jar:git-Bukkit-1.6.4-R2.0-9-g68d0e57-b2930jnks]
    at net.minecraft.server.v1_7_R1.ThreadServerApplication.run(SourceFile:617) [craftbukkit.jar:git-Bukkit-1.6.4-R2.0-9-g68d0e57-b2930jnks]