I added wood and stones to config file and reloaded the plugin, so i killed me to respawn, but nothing happens: i cant even craft a building plan because i dont have materials. I have grant antiitem.use to me
No config error because no error on console (previously i missed a "," and the plugin correctly reported the error). Just added:

"highqualitymetal": 1000,
"metalfragments": 2000,
"stones": 5000,
"wood": 5000

Merged post

Post scriptum: 

just received some error on console: 

Failed to run a 120.00 timer in 'AntiItems v1.0.10' (NullReferenceException: Object reference not set to an instance of an object)
  at Oxide.Plugins.AntiItems.DoItems (BasePlayer player) [0x00096] in :0

  at Oxide.Plugins.AntiItems.RefreshItems (BasePlayer player) [0x0004e] in :0

  at Oxide.Plugins.AntiItems.m__0 () [0x0004a] in :0

  at Oxide.Core.Libraries.Timer+TimerInstance.FireCallback () [0x00018] in <4452f821def6406d834e4149849fe7ea>:0



and then:

Failed to call hook 'OnPlayerRespawned' on plugin 'AntiItems v1.0.10' (NullReferenceException: Object reference not set to an instance of an object)
  at Oxide.Plugins.AntiItems.DoItems (BasePlayer player) [0x00096] in :0

  at Oxide.Plugins.AntiItems.OnPlayerRespawned (BasePlayer player) [0x00000] in :0

  at Oxide.Plugins.AntiItems.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x00161] in :0

  at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in <9affce1cd15c4ec183941adef8db1722>:0

  at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x000d8] in <4452f821def6406d834e4149849fe7ea>:0

  at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in <4452f821def6406d834e4149849fe7ea>:0

Looks to me like you aren't using the correct item names. To correctly work, they need to be the items shortname. You can find these shortnames on some documents around the internet.

You are great, i found the "short name" at https://www.corrosionhour.com/rust-item-list/ but i also suggest to write on plugin documentation the fact that the names are "short names" and not just the names without spaces between words (lol!) 

THX!