Can't download files

[Swedz]

EpicWorldGenerator starts loading in my console... and then after a minute or two, it gives this error:

---- EpicWorldGenerator Crash Report ----
Time: Tue Aug 23 14:27:18 EDT 2016
Description: Could not download structure files

System details:
<> Spigot version = git-Spigot-6abac0c-9935adc (MC: 1.8.8)
<> Plugin version = 7.2.16
<> Java Version = 1.8.0_91


Plugin details:
<> EpicWorldGenerator - 7.2.16 - []
<> WorldEdit - 6.0;3342-78f975b9 - []
<> ViaVersion - 0.9.7 - [_MylesC]
<> hungerFix - 1.2 - [Lotteries, _Surprising]
<> API - 1.0 - [Swedz]
<> Hydra - 1.0 - [Swedz]
<> Base - 1.0 - [Swedz]
<> Wizards - 1.0 - [Swedz]
<> Chat - 1.0 - [Swedz]

Error info:
<> Error message: Could not download structure files
<> Stack trace: 
java.lang.Exception: Could not download structure files
    at com.minelazz.epicworldgenerator.structures.EpicStructureManager.<clinit>(EpicStructureManager.java:44)
    at com.minelazz.epicworldgenerator.EpicWorldGenerator.onLoad(EpicWorldGenerator.java:68)
    at org.bukkit.craftbukkit.v1_8_R3.CraftServer.loadPlugins(CraftServer.java:296)
    at net.minecraft.server.v1_8_R3.DedicatedServer.init(DedicatedServer.java:198)
    at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:524)
    at java.lang.Thread.run(Thread.java:745)

My internet connection on the machine is fine, I can connect to the server & ping the IP.

The thing is, it only does this sometimes... it's really weird.

Why would this be occuring? (Note, I am booting it up for the first time on this server)