:Exception in thread "File IO Thread"
:Task of 'dynmap' generated an exception
:java.lang.OutOfMemoryError
:       at java.util.zip.Deflater.init(Native Method)
:       at net.minecraft.server.RegionFile.b(SourceFile:242)
:       at net.minecraft.server.RegionFileCache.c(SourceFile:94)
:       at net.minecraft.server.ChunkRegionLoader.a(SourceFile:131)
:       at net.minecraft.server.ChunkRegionLoader.c(SourceFile:121)
:       at net.minecraft.server.FileIOThread.b(SourceFile:29)
:       at net.minecraft.server.FileIOThread.run(SourceFile:22)
: