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  1. ,

    You try to parse a String that contains non-numeric characters to an int. The string must contain decimal characters only, optionally beginning with a + or - sign.

  2. ,

    Can occur when you try to convert a String to a numeric value but the String is not well formatted for the conversion.

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java.lang.NumberFormatException: null	at java.lang.Integer.parseInt(Integer.java:542)	at java.lang.Integer.parseInt(Integer.java:615)	at skinsrestorer.shared.utils.YamlConfig.getInt(YamlConfig.java:68)	at skinsrestorer.shared.storage.ConfigStorage.init(ConfigStorage.java:49)	at skinsrestorer.bukkit.SkinsRestorer.onEnable(SkinsRestorer.java:87)	at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:292)	at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:319)	at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:407)	at org.bukkit.craftbukkit.v1_9_R2.CraftServer.loadPlugin(CraftServer.java:358)	at org.bukkit.craftbukkit.v1_9_R2.CraftServer.enablePlugins(CraftServer.java:318)	at net.minecraft.server.v1_9_R2.DedicatedServer.init(DedicatedServer.java:205)	at net.minecraft.server.v1_9_R2.MinecraftServer.run(MinecraftServer.java:573)	at java.lang.Thread.run(Thread.java:745)