Bukkit

Is the problem reproducible ? If yes, please describe how
1.
2.
3.

What's the problem ? What should be ?
i cant get anything to run right just tells me that there was and interal error.

What version of Seasons,Craftbukkit, (ProtocolLib) do you use ?
Seasons, 1.7.9, 3.4.0

Do you have an error log ? If yes, please provide it

[17:14:31] [Server thread/ERROR]: Error occurred while enabling Seasons v2.0.3 (Is it up to date?)
java.lang.NoClassDefFoundError: net/minecraft/server/v1_5_R3/World
    at org.rominos2.Seasons.Managers.SnowManager.SeasonsSnowManager.<init>(SeasonsSnowManager.java:40) ~[?:?]
    at org.rominos2.Seasons.Managers.SeasonsManager.initiate(SeasonsManager.java:67) ~[?:?]
    at org.rominos2.Seasons.Seasons.loadWorld(Seasons.java:187) ~[?:?]
    at org.rominos2.Seasons.Seasons.onEnable(Seasons.java:62) ~[?:?]
    at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:316) ~[craftbukkit-dev.jar:git-Bukkit-1.7.9-R0.2-11-g3fd9db2-b3098jnks]
    at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:324) [craftbukkit-dev.jar:git-Bukkit-1.7.9-R0.2-11-g3fd9db2-b3098jnks]
    at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:404) [craftbukkit-dev.jar:git-Bukkit-1.7.9-R0.2-11-g3fd9db2-b3098jnks]
    at org.bukkit.craftbukkit.v1_7_R3.CraftServer.loadPlugin(CraftServer.java:455) [craftbukkit-dev.jar:git-Bukkit-1.7.9-R0.2-11-g3fd9db2-b3098jnks]
    at org.bukkit.craftbukkit.v1_7_R3.CraftServer.enablePlugins(CraftServer.java:389) [craftbukkit-dev.jar:git-Bukkit-1.7.9-R0.2-11-g3fd9db2-b3098jnks]
    at net.minecraft.server.v1_7_R3.MinecraftServer.n(MinecraftServer.java:352) [craftbukkit-dev.jar:git-Bukkit-1.7.9-R0.2-11-g3fd9db2-b3098jnks]
    at net.minecraft.server.v1_7_R3.MinecraftServer.g(MinecraftServer.java:326) [craftbukkit-dev.jar:git-Bukkit-1.7.9-R0.2-11-g3fd9db2-b3098jnks]
    at net.minecraft.server.v1_7_R3.MinecraftServer.a(MinecraftServer.java:282) [craftbukkit-dev.jar:git-Bukkit-1.7.9-R0.2-11-g3fd9db2-b3098jnks]
    at net.minecraft.server.v1_7_R3.DedicatedServer.init(DedicatedServer.java:182) [craftbukkit-dev.jar:git-Bukkit-1.7.9-R0.2-11-g3fd9db2-b3098jnks]
    at net.minecraft.server.v1_7_R3.MinecraftServer.run(MinecraftServer.java:436) [craftbukkit-dev.jar:git-Bukkit-1.7.9-R0.2-11-g3fd9db2-b3098jnks]
    at net.minecraft.server.v1_7_R3.ThreadServerApplication.run(SourceFile:628) [craftbukkit-dev.jar:git-Bukkit-1.7.9-R0.2-11-g3fd9db2-b3098jnks]
Caused by: java.lang.ClassNotFoundException: net.minecraft.server.v1_5_R3.World
    at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:67) ~[craftbukkit-dev.jar:git-Bukkit-1.7.9-R0.2-11-g3fd9db2-b3098jnks]
    at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:62) ~[craftbukkit-dev.jar:git-Bukkit-1.7.9-R0.2-11-g3fd9db2-b3098jnks]
    at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.7.0_72]
    at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.7.0_72]
    ... 15 more

Please provide the seasons config.
Seasons:
  Spring:
    Visual:
      Textures: ''
      Snow: 0
    ShortName: spring
    Lengths:
      Season: 6624.0
      Weather: 0.5
    Percentages:
      Sun: 30
      Rain: 60
      Thunder: 10
    SpecialDays:
      '1': First Day of Spring
      '6624': Last Day of Spring
    SnowManagerSpeed:
      Place: 0
      Remove: 0
    Time:
      Day: 14000
      Night: 10000
  Summer:
    Visual:
      Textures: ''
      Snow: 0
    ShortName: summer
    Lengths:
      Season: 6624.0
      Weather: 0.5
    Percentages:
      Sun: 65
      Rain: 10
      Thunder: 25
    SpecialDays:
      '1': First Day of Summer
      '6624': Last Day of Summer
    SnowManagerSpeed:
      Place: 0
      Remove: 0
    Time:
      Day: 14000
      Night: 10000
  Autumn:
    Visual:
      Textures: ''
      Snow: 25
    ShortName: autumn
    Lengths:
      Season: 6552.0
      Weather: 0.5
    Percentages:
      Sun: 30
      Rain: 60
      Thunder: 10
    SpecialDays:
      '1': First Day of Autumn
      '6552': Last Day of Autumn
    SnowManagerSpeed:
      Place: 0.5
      Remove: 0.5
    Time:
      Day: 14000
      Night: 10000
  Winter:
    Visual:
      Textures: ''
      Snow: 100
    ShortName: winter
    Lengths:
      Season: 6480.0
      Weather: 0.5
    Percentages:
      Sun: 30
      Rain: 60
      Thunder: 10
    SpecialDays:
      '1': First Day of Winter
      '3240': Mid Winter
      '6480': Last Day of Winter
    SnowManagerSpeed:
      Place: 0
      Remove: 0
    Time:
      Day: 14000
      Night: 10000
Properties:
  Active: true
  LogInfo: true
  Resolution:
    Precision: 0.01
    TimeCheck: 20
  Regen:
    Snow: true
    Ice: true
  Messages:
    ChangeMessage: Seasons changes to <name>.
    SeasonsMessage: You're in <name> for another <number> days.
    SpecialDayMessage: It's <name>.
    Weather: The current weather is <name>.
    Color: b
    NotActive: Seasons are not active in this world.
    Sign:
    - <name>
    - <day>/<length>
    - <specialDay>
    ColorList:
      BLACK: '0'
      DARK_BLUE: '1'
      DARK_GREEN: '2'
      DARK_AQUA: '3'
      DARK_RED: '4'
      DARK_PURPLE: '5'
      GOLD: '6'
      GRAY: '7'
      DARK_GRAY: '8'
      BLUE: '9'
      GREEN: a
      AQUA: b
      RED: c
      LIGHT_PURPLE: d
      YELLOW: e
      WHITE: f
      MAGIC: k
      BOLD: l
      STRIKETHROUGH: m
      UNDERLINE: n
      ITALIC: o
      RESET: r
  Debug: false

Any more informations ?

have not tryed to debug yet but i will