[SEVERE] Could not load 'plugins\MobArena.jar' in folder 'plugins': 
while scanning for the next token
found character '\t' that cannot start any token
in "<reader>", line 63, column 1:

^

at org.yaml.snakeyaml.scanner.ScannerImpl.fetchMoreTokens(ScannerImpl.java:360)
at org.yaml.snakeyaml.scanner.ScannerImpl.checkToken(ScannerImpl.java:183)
at org.yaml.snakeyaml.parser.ParserImpl$ParseBlockMappingKey.produce(ParserImpl.java:564)
at org.yaml.snakeyaml.parser.ParserImpl.peekEvent(ParserImpl.java:163)
at org.yaml.snakeyaml.parser.ParserImpl.checkEvent(ParserImpl.java:148)
at org.yaml.snakeyaml.composer.Composer.composeMappingNode(Composer.java:228)
at org.yaml.snakeyaml.composer.Composer.composeNode(Composer.java:160)
at org.yaml.snakeyaml.composer.Composer.composeMappingNode(Composer.java:230)
at org.yaml.snakeyaml.composer.Composer.composeNode(Composer.java:160)
at org.yaml.snakeyaml.composer.Composer.composeMappingNode(Composer.java:230)
at org.yaml.snakeyaml.composer.Composer.composeNode(Composer.java:160)
at org.yaml.snakeyaml.composer.Composer.composeMappingNode(Composer.java:230)
at org.yaml.snakeyaml.composer.Composer.composeNode(Composer.java:160)
at org.yaml.snakeyaml.composer.Composer.composeMappingNode(Composer.java:230)
at org.yaml.snakeyaml.composer.Composer.composeNode(Composer.java:160)
at org.yaml.snakeyaml.composer.Composer.composeMappingNode(Composer.java:230)
at org.yaml.snakeyaml.composer.Composer.composeNode(Composer.java:160)
at org.yaml.snakeyaml.composer.Composer.composeDocument(Composer.java:122)
at org.yaml.snakeyaml.composer.Composer.getSingleNode(Composer.java:105)
at org.yaml.snakeyaml.constructor.BaseConstructor.getSingleData(BaseConstructor.java:124)
at org.yaml.snakeyaml.Yaml.load(Yaml.java:264)
at org.bukkit.util.config.Configuration.load(Configuration.java:82)
at org.bukkit.plugin.java.JavaPlugin.initialize(JavaPlugin.java:157)
at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:175)
at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:213)
at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:136)
at org.bukkit.craftbukkit.CraftServer.loadPlugins(CraftServer.java:143)
at org.bukkit.craftbukkit.CraftServer.<init>(CraftServer.java:110)
at net.minecraft.server.ServerConfigurationManager.<init>(ServerConfigurationManager.java:51)
at net.minecraft.server.MinecraftServer.init(MinecraftServer.java:133)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:337)
at net.minecraft.server.ThreadServerApplication.run(SourceFile:422)