It doesn't load on 1.8.x
[21:53:10] [Server thread/INFO]: [FastAsyncRedstone] Injecting custom classes
[21:53:10] [Server thread/ERROR]: Could not load 'plugins/FastAsyncRedstone-16.12.03-e31de71-18-0.1.13.jar' in folder 'plugins'
org.bukkit.plugin.InvalidPluginException: java.lang.NoSuchMethodError: com.boydti.far.RedstoneSettings.load(Ljava/io/File;Ljava/lang/Class;)Z
at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:135) ~[custom.jar:git-Spigot-fdc1440-53fac9f]
at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:329) ~[custom.jar:git-Spigot-fdc1440-53fac9f]
at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:251) [custom.jar:git-Spigot-fdc1440-53fac9f]
at org.bukkit.craftbukkit.v1_8_R3.CraftServer.loadPlugins(CraftServer.java:292) [custom.jar:git-Spigot-fdc1440-53fac9f]
at net.minecraft.server.v1_8_R3.DedicatedServer.init(DedicatedServer.java:198) [custom.jar:git-Spigot-fdc1440-53fac9f]
at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:524) [custom.jar:git-Spigot-fdc1440-53fac9f]
at java.lang.Thread.run(Thread.java:745) [?:1.8.0_91]
Caused by: java.lang.NoSuchMethodError: com.boydti.far.RedstoneSettings.load(Ljava/io/File;Ljava/lang/Class;)Z
at com.boydti.far.RedstoneSettings.load(RedstoneSettings.java:52) ~[?:?]
at com.boydti.far.FarMain.setupConfig(FarMain.java:57) ~[?:?]
at com.boydti.far.FarMain.
The plugin is broken because the author hasn't updated it to work with the new FAWE.
So it would occur on every version?
Yes, every version unless you used older FAWE versions. I am not sure how far back you'd have to go to correct this error.
Aw.. would be a pain trying with every version