Remove this block:
(use MCEdit if you can sort it out in any other way)
-- Block entity being ticked --
Details:
Name: rftoolsdim_dimension_editor // mcjty.rftoolsdim.blocks.editor.DimensionEditorTileEntity
Block type: ID #2904 (tile.rftoolsdim.dimension_editor // mcjty.rftoolsdim.blocks.editor.DimensionEditorBlock)
Block data value: 5 / 0x5 / 0b0101
Block location: World: (267,62,206), Chunk: (at 11,3,14 in 16,12; contains blocks 256,0,192 to 271,255,207), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Actual block type: ID #2904 (tile.rftoolsdim.dimension_editor // mcjty.rftoolsdim.blocks.editor.DimensionEditorBlock)
Actual block data value: 5 / 0x5 / 0b0101
Stacktrace:
at net.minecraft.world.World.func_72939_s(World.java:1804)
at net.minecraft.world.WorldServer.func_72939_s(WorldServer.java:620)