problem with forge on server

[g008y]

  hey man i am making a direwolf20 fan server and it was working but it went wrong so i went to install it again but i keep getting this

java.lang.OutOfMemoryError: Java heap space

at ge.d(World.java:1499)

at vr.a(AnvilChunkLoader.java:382)

at vr.a(AnvilChunkLoader.java:82)

at vr.a(AnvilChunkLoader.java:65)

at mp.e(ChunkProviderServer.java:150)

at mp.c(ChunkProviderServer.java:101)

at net.minecraft.server.MinecraftServer.a(MinecraftServer.java:329)

at net.minecraft.server.MinecraftServer.s(MinecraftServer.java:246)

at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:412)

at dn.run(SourceFile:492)

i have looked everywhere on this forum but cant find anything

[LexManos]

It seems that you are running out of memory, how much memory are you allocating to minecraft?

It cant load all of ther world that it needs to load.