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