I'm getting this spammed in my console every hour or less. It comes and goes. Any help would be awesome. Thank you.

Failed to call hook 'OnDispenserGather' on plugin 'GatherManager v2.2.75' (KeyNotFoundException: The given key was not present in the dictionary.)
  at System.Collections.Generic.Dictionary`2[TKey,TValue].get_Item (TKey key) [0x0001e] in <fb001e01371b4adca20013e0ac763896>:0
  at Oxide.Plugins.GatherManager.OnDispenserGather (ResourceDispenser dispenser, BaseEntity entity, Item item) [0x000d0] in <6e4798503ee44180822bebc8cd3ef09e>:0
  at Oxide.Plugins.GatherManager.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x001dd] in <6e4798503ee44180822bebc8cd3ef09e>:0
  at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in <80b90e8213db44b29ec2d4111764172c>:0
  at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x000d8] in <ec05e0208c9149bba43236ca58fea105>:0
  at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in <ec05e0208c9149bba43236ca58fea105>:0

if (!GatherResourceModifiers.ContainsKey(gatherType))

should be

if (!GatherDispenserModifiers.ContainsKey(gatherType))

nivex

if (!GatherResourceModifiers.ContainsKey(gatherType))

should be

if (!GatherDispenserModifiers.ContainsKey(gatherType))

This has resolved my issue. Thank you.