When I run the server which has rankgrant plus installed it comes up with this, and I can't use /grant 

[12:08:15] [Server-Worker-6/INFO]: Preparing spawn area: 83%
[12:08:15] [Server-Worker-5/INFO]: Preparing spawn area: 83%
[12:08:15] [Server thread/INFO]: Time elapsed: 3956 ms
[12:08:15] [Server thread/INFO]: [Multiverse-Core] 4 - World(s) loaded.
[12:08:15] [Server thread/INFO]: [Multiverse-Core] Version 2.5-b719 (API v20) Enabled - By Rigby, fernferret, lithium3141 and main--
[12:08:15] [Server thread/INFO]: [RankGrant+] Enabling RankGrantPlus v3.5.2
[12:08:16] [Server thread/INFO]: [RankGrant+] Enabling RankGrant+...

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[12:08:16] [Server thread/INFO]: [RankGrant+] Loading files...
[12:08:16] [Server thread/INFO]: [RankGrant+] Loaded files.
[12:08:16] [Server thread/INFO]: [RankGrant+] Registering commands...
[12:08:16] [Server thread/INFO]: [RankGrant+] Registered commands.
[12:08:16] [Server thread/INFO]: [RankGrant+] Registering listeners...
[12:08:16] [Server thread/INFO]: [RankGrant+] Registered listeners.
[12:08:16] [Server thread/INFO]: [RankGrant+] Hooking into Vault...
[12:08:16] [Server thread/INFO]: [RankGrant+] Hooked into Vault.
[12:08:16] [Server thread/WARN]: [RankGrant+] Error! Generating stack trace...
[12:08:16] [Server thread/WARN]: java.lang.Exception: NullCommands
[12:08:16] [Server thread/WARN]: at com.demeng7215.rankgrantplus.RankGrantPlus.setupCommands(RankGrantPlus.java:226)
[12:08:16] [Server thread/WARN]: at com.demeng7215.rankgrantplus.RankGrantPlus.onEnable(RankGrantPlus.java:87)
[12:08:16] [Server thread/WARN]: at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:263)
[12:08:16] [Server thread/WARN]: at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:352)
[12:08:16] [Server thread/WARN]: at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:417)
[12:08:16] [Server thread/WARN]: at org.bukkit.craftbukkit.v1_14_R1.CraftServer.enablePlugin(CraftServer.java:461)
[12:08:16] [Server thread/WARN]: at org.bukkit.craftbukkit.v1_14_R1.CraftServer.enablePlugins(CraftServer.java:375)
[12:08:16] [Server thread/WARN]: at net.minecraft.server.v1_14_R1.MinecraftServer.a(MinecraftServer.java:449)
[12:08:16] [Server thread/WARN]: at net.minecraft.server.v1_14_R1.DedicatedServer.init(DedicatedServer.java:258)
[12:08:16] [Server thread/WARN]: at net.minecraft.server.v1_14_R1.MinecraftServer.run(MinecraftServer.java:776)
[12:08:16] [Server thread/WARN]: at java.lang.Thread.run(Unknown Source)
[12:08:16] [Server thread/INFO]: [RankGrant+] ====================== [ ERROR ] ======================
[12:08:16] [Server thread/INFO]: [RankGrant+] Uh oh! An error has occurred in RankGrantPlus!
[12:08:16] [Server thread/INFO]: [RankGrant+] Error ID: 6
[12:08:16] [Server thread/INFO]: [RankGrant+] Error Description: Grant/ungrant commands are not set (configuration.yml)
[12:08:16] [Server thread/INFO]: [RankGrant+] Get support using one of the support options.
[12:08:16] [Server thread/INFO]: [RankGrant+] ====================== [ ERROR ] ======================
[12:08:16] [Server thread/INFO]: [RankGrant+] Disabling RankGrantPlus v3.5.2
[12:08:16] [Server thread/INFO]: [RankGrant+] RankGrantPlus v3.5.2 by Demeng7215 has been successfully disabled.
[12:08:16] [Server thread/INFO]: [Essentials] Enabling Essentials v2.17.1.0
[12:08:16] [Server thread/INFO]: Attempting to convert old kits in config.yml to new kits.yml
[12:08:16] [Server thread/INFO]: No kits found to migrate.
[12:08:16] [Server thread/INFO]: [Essentials] Using 1.8.3+ BlockStateMeta provider as mob spawner provider.
[12:08:16] [Server thread/INFO]: [Essentials] Using 1.13+ flat spawn egg provider as spawn egg provider.
[12:08:16] [Server thread/INFO]: [Essentials] Using 1.9+ BasePotionData provider as potion meta provider.
[12:08:16] [Server thread/INFO]: Loaded 20977 items from items.json.
[12:08:16] [Server thread/INFO]: Using locale en_GB
[12:08:16] [Server thread/INFO]: [Essentials] ServerListPingEvent: Spigot iterator API
[12:08:16] [Server thread/INFO]: [Essentials] Starting Metrics. Opt-out using the global bStats config.
[12:08:16] [Server thread/INFO]: [Vault] [Vault][Economy] Essentials Economy hooked.
[12:08:16] [Server thread/INFO]: [Essentials] Using superperms-based permissions.
[12:08:16] [Server thread/INFO]: Server permissions file permissions.yml is empty, ignoring it
[12:08:17] [Server thread/INFO]: Done (13.601s)! For help, type "help"
[12:08:17] [Craft Scheduler Thread - 5/INFO]: [Vault] Checking for Updates ...
[12:08:17] [Craft Scheduler Thread - 5/INFO]: [Vault] No new version available
[12:08:19] [Server thread/INFO]: [MinigamesLib] Found 0 arenas.