Problem/Bug Help? Weird Permissions.yml Issue In Mohist CraftBukkit + Paper + Spigot

It states groups and users are "Already defined". I don't understand this as I normally code in C#.

Log:

Code:

[15:57:55] [Server thread/ERROR]: Permission in permissions.yml was already defined
java.lang.IllegalArgumentException: The permission groups is already defined!
    at org.bukkit.plugin.SimplePluginManager.addPermission(SimplePluginManager.java:593) ~[SimplePluginManager.class:809b10e]
    at org.bukkit.plugin.SimplePluginManager.addPermission(SimplePluginManager.java:586) ~[SimplePluginManager.class:809b10e]
    at org.bukkit.craftbukkit.v1_12_R1.CraftServer.loadCustomPermissions(CraftServer.java:837) [CraftServer.class:809b10e]
    at org.bukkit.craftbukkit.v1_12_R1.CraftServer.enablePlugins(CraftServer.java:421) [CraftServer.class:809b10e]
    at net.minecraft.server.MinecraftServer.func_71243_i(MinecraftServer.java:433) [MinecraftServer.class:?]
    at net.minecraft.server.MinecraftServer.func_71222_d(MinecraftServer.java:388) [MinecraftServer.class:?]
    at net.minecraft.server.MinecraftServer.func_71247_a(MinecraftServer.java:345) [MinecraftServer.class:?]
    at net.minecraft.server.dedicated.DedicatedServer.func_71197_b(DedicatedServer.java:316) [nz.class:?]
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:598) [MinecraftServer.class:?]
    at java.lang.Thread.run(Unknown Source) [?:1.8.0_101]
[15:57:55] [Server thread/ERROR]: Permission in permissions.yml was already defined
java.lang.IllegalArgumentException: The permission users is already defined!
    at org.bukkit.plugin.SimplePluginManager.addPermission(SimplePluginManager.java:593) ~[SimplePluginManager.class:809b10e]
    at org.bukkit.plugin.SimplePluginManager.addPermission(SimplePluginManager.java:586) ~[SimplePluginManager.class:809b10e]
    at org.bukkit.craftbukkit.v1_12_R1.CraftServer.loadCustomPermissions(CraftServer.java:837) [CraftServer.class:809b10e]
    at org.bukkit.craftbukkit.v1_12_R1.CraftServer.enablePlugins(CraftServer.java:421) [CraftServer.class:809b10e]
    at net.minecraft.server.MinecraftServer.func_71243_i(MinecraftServer.java:433) [MinecraftServer.class:?]
    at net.minecraft.server.MinecraftServer.func_71222_d(MinecraftServer.java:388) [MinecraftServer.class:?]
    at net.minecraft.server.MinecraftServer.func_71247_a(MinecraftServer.java:345) [MinecraftServer.class:?]
    at net.minecraft.server.dedicated.DedicatedServer.func_71197_b(DedicatedServer.java:316) [nz.class:?]
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:598) [MinecraftServer.class:?]
    at java.lang.Thread.run(Unknown Source) [?:1.8.0_101]

My Permissions.yml:

Code:

groups:
  Member:
    default: true
    permissions:
      - bukkit.command.kill
      - minecraft.command.help
    inheritance: []
    info:
      prefix: '[Member] '
      build: true
      suffix: ''
  Admin:
    default: false
    permissions: []
    inheritance: Member
    info:
      prefix: '[&5Admin&f] '
      build: true
      suffix: ''
  Owner:
    default: false
    permissions: []
    inheritance: Member
    info:
      prefix: '[&5Owner&f] '
      build: true
      suffix: ''
users:
  OFWModz:
    subgroups: []
    permissions: []
    group: default

Any ideas?