Minecraft CurseForge

You are running a client mod on a server.

Then why are the forums still here?

What block from AngelOfVengeance did you use because that is most likely the problem, because it is a corrupted tile entity.

java.lang.NullPointerException: null
    at net.minecraft.nbt.NBTTagCompound.func_152449_a(NBTTagCompound.java:497) ~[fy.class:?]
    at net.minecraft.nbt.NBTTagCompound.func_152446_a(NBTTagCompound.java:58) ~[fy.class:?]
    at net.minecraft.nbt.NBTTagCompound.func_152449_a(NBTTagCompound.java:497) ~[fy.class:?]
    at net.minecraft.nbt.NBTTagCompound.func_152446_a(NBTTagCompound.java:58) ~[fy.class:?]
    at net.minecraft.nbt.CompressedStreamTools.func_152455_a(CompressedStreamTools.java:133) ~[gi.class:?]
    at net.minecraft.nbt.CompressedStreamTools.func_152456_a(CompressedStreamTools.java:88) ~[gi.class:?]
    at net.minecraft.nbt.CompressedStreamTools.func_74794_a(CompressedStreamTools.java:83) ~[gi.class:?]
    at net.minecraft.world.chunk.storage.AnvilChunkLoader.loadChunk__Async(AnvilChunkLoader.java:89) ~[aye.class:?]
    at net.minecraftforge.common.chunkio.ChunkIOProvider.run(ChunkIOProvider.java:70) ~[ChunkIOProvider.class:?]
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) [?:1.8.0_211]
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) [?:1.8.0_211]
    at java.lang.Thread.run(Unknown Source) [?:1.8.0_211]

[08:44:34] [Chunk I/O Executor Thread-1/ERROR] [FML]: World: (512,64,768), Chunk: (at 0,4,0 in 32,48; contains blocks 512,0,768 to 527,255,783), Region: (1,1; contains chunks 32,32 to 63,63, blocks 512,0,512 to 1023,255,1023)