Error

13:03:16 [SEVERE] Could not load 'plugins\SimplePL.jar' in folder 'plugins': Inv
alid plugin.yml: null; mapping values are not allowed here
org.bukkit.plugin.InvalidDescriptionException: Invalid plugin.yml: null; mapping
 values are not allowed here
        at org.bukkit.plugin.java.JavaPluginLoader.getPluginDescription(JavaPlug
inLoader.java:193)
        at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager
.java:119)
        at org.bukkit.craftbukkit.CraftServer.loadPlugins(CraftServer.java:164)
        at org.bukkit.craftbukkit.CraftServer.<init>(CraftServer.java:140)
        at net.minecraft.server.ServerConfigurationManager.<init>(ServerConfigur
ationManager.java:52)
        at net.minecraft.server.MinecraftServer.init(MinecraftServer.java:148)
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:408)
        at net.minecraft.server.ThreadServerApplication.run(SourceFile:465)
Caused by: mapping values are not allowed here
 in "<reader>", line 5, column 9:
    commands:
            ^

        at org.yaml.snakeyaml.scanner.ScannerImpl.fetchValue(ScannerImpl.java:73
3)
        at org.yaml.snakeyaml.scanner.ScannerImpl.fetchMoreTokens(ScannerImpl.ja
va:305)
        at org.yaml.snakeyaml.scanner.ScannerImpl.peekToken(ScannerImpl.java:202
)
        at org.yaml.snakeyaml.parser.ParserImpl$ParseDocumentEnd.produce(ParserI
mpl.java:265)
        at org.yaml.snakeyaml.parser.ParserImpl.peekEvent(ParserImpl.java:161)
        at org.yaml.snakeyaml.parser.ParserImpl.getEvent(ParserImpl.java:171)
        at org.yaml.snakeyaml.composer.Composer.composeDocument(Composer.java:12
5)
        at org.yaml.snakeyaml.composer.Composer.getSingleNode(Composer.java:106)

        at org.yaml.snakeyaml.constructor.BaseConstructor.getSingleData(BaseCons
tructor.java:121)
        at org.yaml.snakeyaml.Yaml.loadFromReader(Yaml.java:480)
        at org.yaml.snakeyaml.Yaml.load(Yaml.java:411)
        at org.bukkit.plugin.PluginDescriptionFile.<init>(PluginDescriptionFile.
java:37)
        at org.bukkit.plugin.java.JavaPluginLoader.getPluginDescription(JavaPlug
inLoader.java:188)
        ... 7 more