press wirh horse rerror

This does not happen evertime sometimes i can get 5 to 10 good runs when this happens the press needs to be replaced resets will not fix the issue

01:58] SF Press horse: Finished! - Sugar Extract
[01:58] SF Press horse: [YEngine]: Exception while running 2b67d5b7-8c78-4cca-b69d-0d09720a2f28
[01:58] SF Press horse: ArgumentException: An item with the same key has already been added. Key: 275090397
[01:58] SF Press horse: Prim: <SF Press horse>, Script: <machine>, Location: Green Acres 2 <655,687,26>
[01:58] SF Press horse: Script must be Reset to re-enable.
[01:58] SF Press horse:   at System.Collections.Generic.Dictionary`2[TKey,TValue].TryInsert (TKey key, TValue value, System.Collections.Generic.InsertionBehavior behavior) [0x000dd] in <d636f104d58046fd9b195699bcb1a744>:0
[01:58] SF Press horse:   at System.Collections.Generic.Dictionary`2[TKey,TValue].Add (TKey key, TValue value) [0x00000] in <d636f104d58046fd9b195699bcb1a744>:0
[01:58] SF Press horse:   at OpenSim.Region.PhysicsModule.BulletS.BSScene.AddAvatar (System.UInt32 localID, System.String avName, OpenMetaverse.Vector3 position, OpenMetaverse.Vector3 size, System.Single footOffset, System.Boolean isFlying) [0x00030] in <f7986a3de5f5422eafbc77088c5b4aa3>:0
[01:58] SF Press horse:   at OpenSim.Region.Framework.Scenes.ScenePresence.AddToPhysicalScene (System.Boolean isFlying) [0x000a3] in <a45bb6483552402c9a97be2297a6680c>:0
[01:58] SF Press horse:   at OpenSim.Region.Framework.Scenes.ScenePresence.StandUp (System.Boolean addPhys) [0x0031b] in <a45bb6483552402c9a97be2297a6680c>:0
[01:58] SF Press horse:   at OpenSim.Region.ScriptEngine.Shared.Api.LSL_Api.llUnSit (System.String id) [0x0003d] in <2f8492c5777c493589d6a8ee087405c4>:0
[01:58] SF Press horse:   at OpenSim.Region.ScriptEngine.Shared.ScriptBase.ScriptBaseClass.llUnSit (System.String id) [0x00000] in <322829c5f8b3493a82bb30d18bf3eab3>:0
[01:58] SF Press horse:   at (wrapper dynamic-method) System.Object.refresh()(XMRInstanceSuperType)
[01:58] SF Press horse:   at (wrapper dynamic-method) System.Object.default timer(OpenSim.Region.ScriptEngine.Yengine.XMRInstAbstract)
[01:58] SF Press horse:   at OpenSim.Region.ScriptEngine.Yengine.XMRInstAbstract.CallSEH () [0x0003d] in <558c65dea34f4504ba1db9c2d1afc31f>:0
[01:58] SF Press horse:   at OpenSim.Region.ScriptEngine.Yengine.XMRInstance.StartEx () [0x00007] in <558c65dea34f4504ba1db9c2d1afc31f>:0
 

IN ADDITIOIN  when using oats the precentage is set at 30% that alway leaves 10% left perhaps 20% would be better