Exception while calling NextTick callback (NullReferenceException: Object reference not set to an instance of an object)
at Oxide.Plugins.TreePlanter.IsBlockedAgri (System.String shortname) [0x00000] in <48910dbfba044a1db7b102b3725f2fb1>:0 21,760 ents, 0 slprs 3kb/s in, 3kb/s out
at Oxide.Plugins.TreePlanter.TryPlantSeed (BasePlayer player, Item item, GrowableEntity entity) [0x00012] in <48910dbfba044a1db7b102b3725f2fb1>:0
at Oxide.Plugins.TreePlanter+<OnEntityBuilt>c__AnonStorey0.<>m__0 () [0x000cb] in <48910dbfba044a1db7b102b3725f2fb1>:0
at Oxide.Core.OxideMod.OnFrame (System.Single delta) [0x00051] in <9882f28dc2204b4dba514a9ad18f5042>:0

what version of tree planter are your currently running ?, looks like you might be outdated please ensure you are updated.

i had an old one then i updated 
So i will remove the config and retry 
cheers

Tree planter was spamming console. updated just now and the spamming continued. 

(12:13:14) | Exception while calling NextTick callback (NullReferenceException: Object reference not set to an instance of an object)

at Oxide.Plugins.TreePlanter.IsBlockedAgri (System.String shortname) [0x00000] in <b82f9ab882f74fc691532b74ef91399e>:0

at Oxide.Plugins.TreePlanter.TryPlantSeed (BasePlayer player, Item item, GrowableEntity entity) [0x00012] in <b82f9ab882f74fc691532b74ef91399e>:0

at Oxide.Plugins.TreePlanter+<OnEntityBuilt>c__AnonStorey0.<>m__0 () [0x000cb] in <b82f9ab882f74fc691532b74ef91399e>:0

at Oxide.Core.OxideMod.OnFrame (System.Single delta) [0x00051] in <9882f28dc2204b4dba514a9ad18f5042>:0

please update to the latest verions and regen config

 [Error] Exception while calling NextTick callback (NullReferenceException: Object reference not set to an instance of an object)
  at Oxide.Plugins.TreePlanter.IsBlockedAgri (System.String shortname) [0x00000] in <dd7aad3abfbf455bb54d3b75328a5ae0>:0 
  at Oxide.Plugins.TreePlanter.TryPlantSeed (BasePlayer player, Item item, GrowableEntity entity) [0x00012] in <dd7aad3abfbf455bb54d3b75328a5ae0>:0 
  at Oxide.Plugins.TreePlanter+<OnEntityBuilt>c__AnonStorey0.<>m__0 () [0x000cb] in <dd7aad3abfbf455bb54d3b75328a5ae0>:0 
  at Oxide.Core.OxideMod.OnFrame (System.Single delta) [0x00051] in <9882f28dc2204b4dba514a9ad18f5042>:0 

same or similar error on all my servers

Exception while calling NextTick callback (NullReferenceException: Object reference not set to an instance of an object)
  at Oxide.Plugins.TreePlanter.IsBlockedAgri (System.String shortname) [0x00000] in <49b7e386be1546d0978e2e64264cb4b6>:0
  at Oxide.Plugins.TreePlanter.TryPlantSeed (BasePlayer player, Item item, GrowableEntity entity) [0x00012] in <49b7e386be1546d0978e2e64264cb4b6>:0
  at Oxide.Plugins.TreePlanter+<OnEntityBuilt>c__AnonStorey0.<>m__0 () [0x000cb] in <49b7e386be1546d0978e2e64264cb4b6>:0
  at Oxide.Core.OxideMod.OnFrame (System.Single delta) [0x00051] in <9882f28dc2204b4dba514a9ad18f5042>:0
(Filename: ./Runtime/Export/Debug/Debug.bindings.h Line: 39)
​

please update the latest version of the plugin and update your config