Bukkit

What steps will reproduce the problem?
1. Place down a sign with the [Buy] text, along with either the Id 162 or 162:1 (Any quantity or price is fine.) You should see that the 162(:1) changes to Log2 or Log2:1
2. Do /stop to stop the server.
3. Start server up.

What is the expected output? What do you see instead?

In the server command prompt (or terminal), you should see:
[13:57:22 INFO]: BetterShops - Loading Sign Shops...
[13:57:22 INFO]: BetterShops - An error occurred! Please inform the developer @ http://dev.bukkit.org/bukkit-plugins/better-shops/ . Plugin Disabling!
[13:57:22 WARN]: java.lang.IllegalArgumentException: No enum constant org.bukkit.Material.LOG2
[13:57:22 WARN]:     at java.lang.Enum.valueOf(Enum.java:238)
[13:57:22 WARN]:     at org.bukkit.Material.valueOf(Material.java:1)
[13:57:22 WARN]:     at max.hubbard.bettershops.Shops.Types.Sign.SignShopManager.loadSignShops(SignShopManager.java:182)
[13:57:22 WARN]:     at max.hubbard.bettershops.Core.loadShops(Core.java:456)
[13:57:22 WARN]:     at max.hubbard.bettershops.Core.onEnable(Core.java:229)
[13:57:22 WARN]:     at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:321)
[13:57:22 WARN]:     at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:340)
[13:57:22 WARN]:     at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:405)
[13:57:22 WARN]:     at org.bukkit.craftbukkit.v1_8_R3.CraftServer.loadPlugin(CraftServer.java:357)
[13:57:22 WARN]:     at org.bukkit.craftbukkit.v1_8_R3.CraftServer.enablePlugins(CraftServer.java:317)
[13:57:22 WARN]:     at net.minecraft.server.v1_8_R3.MinecraftServer.s(MinecraftServer.java:414)
[13:57:22 WARN]:     at net.minecraft.server.v1_8_R3.MinecraftServer.k(MinecraftServer.java:378)
[13:57:22 WARN]:     at net.minecraft.server.v1_8_R3.MinecraftServer.a(MinecraftServer.java:333)
[13:57:22 WARN]:     at net.minecraft.server.v1_8_R3.DedicatedServer.init(DedicatedServer.java:263)
[13:57:22 WARN]:     at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:524)
[13:57:22 WARN]:     at java.lang.Thread.run(Thread.java:745)
[13:57:22 INFO]: BetterShops - Saving Shops..
[13:57:22 INFO]: BetterShops - Saved!

What version of the product are you using?

2.1.2

Do you have an error log of what happened?

Yes:
[13:57:22] [Server thread/INFO]: [BetterShops] Enabling BetterShops v2.1.2
[13:57:22] [Server thread/INFO]: BetterShops - Enabling BetterShops 2.1.2
[13:57:22] [Server thread/INFO]: BetterShops - Loading support for CraftBukkit v1.8.R3
[13:57:22] [Server thread/INFO]: BetterShops - Loading support for WorldGuard
[13:57:22] [Server thread/INFO]: BetterShops - Loading support for Citizens
[13:57:22] [Server thread/INFO]: BetterShops - Using Metrics - http://mcstats.org
[13:57:22] [Server thread/INFO]: BetterShops - Starting Loading of Chest Shops (0) Via File
[13:57:22] [Server thread/INFO]: BetterShops - Done!
[13:57:22] [Server thread/INFO]: BetterShops - Loaded 0 Chest Shops
[13:57:22] [Server thread/INFO]: BetterShops - Some shops may still be initializing, this may last a few minutes
[13:57:22] [Server thread/INFO]: BetterShops - Loading Sign Shops...
[13:57:22] [Server thread/INFO]: BetterShops - An error occurred! Please inform the developer @ http://dev.bukkit.org/bukkit-plugins/better-shops/ . Plugin Disabling!
[13:57:22] [Server thread/WARN]: java.lang.IllegalArgumentException: No enum constant org.bukkit.Material.LOG2
[13:57:22] [Server thread/WARN]:     at java.lang.Enum.valueOf(Enum.java:238)
[13:57:22] [Server thread/WARN]:     at org.bukkit.Material.valueOf(Material.java:1)
[13:57:22] [Server thread/WARN]:     at max.hubbard.bettershops.Shops.Types.Sign.SignShopManager.loadSignShops(SignShopManager.java:182)
[13:57:22] [Server thread/WARN]:     at max.hubbard.bettershops.Core.loadShops(Core.java:456)
[13:57:22] [Server thread/WARN]:     at max.hubbard.bettershops.Core.onEnable(Core.java:229)
[13:57:22] [Server thread/WARN]:     at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:321)
[13:57:22] [Server thread/WARN]:     at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:340)
[13:57:22] [Server thread/WARN]:     at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:405)
[13:57:22] [Server thread/WARN]:     at org.bukkit.craftbukkit.v1_8_R3.CraftServer.loadPlugin(CraftServer.java:357)
[13:57:22] [Server thread/WARN]:     at org.bukkit.craftbukkit.v1_8_R3.CraftServer.enablePlugins(CraftServer.java:317)
[13:57:22] [Server thread/WARN]:     at net.minecraft.server.v1_8_R3.MinecraftServer.s(MinecraftServer.java:414)
[13:57:22] [Server thread/WARN]:     at net.minecraft.server.v1_8_R3.MinecraftServer.k(MinecraftServer.java:378)
[13:57:22] [Server thread/WARN]:     at net.minecraft.server.v1_8_R3.MinecraftServer.a(MinecraftServer.java:333)
[13:57:22] [Server thread/WARN]:     at net.minecraft.server.v1_8_R3.DedicatedServer.init(DedicatedServer.java:263)
[13:57:22] [Server thread/WARN]:     at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:524)
[13:57:22] [Server thread/WARN]:     at java.lang.Thread.run(Thread.java:745)
[13:57:22] [Server thread/INFO]: BetterShops - Saving Shops..
[13:57:22] [Server thread/INFO]: BetterShops - Saved!

Please provide any additional information below.

Please Fix this, my server relies on this wonderful plugin. :)