is this error related to the mod, or another issue?

MissingFieldException: Field not found: single .SellOrder.priceMultiplier Due to: Could not find field in class at VendingMachine.ServerInit () [0x0003a] in <2be1c222040645469e3d0dc0f3d44adf>:0 at NPCVendingMachine.ServerInit () [0x00000] in <2be1c222040645469e3d0dc0f3d44adf>:0 at InvisibleVendingMachine.ServerInit () [0x00000] in <2be1c222040645469e3d0dc0f3d44adf>:0 at BaseNetworkable.Spawn () [0x0004f] in <2be1c222040645469e3d0dc0f3d44adf>:0 at BaseEntity.Spawn () [0x00000] in <2be1c222040645469e3d0dc0f3d44adf>:0 at BaseEntity.SpawnAsMapEntity () [0x00096] in <2be1c222040645469e3d0dc0f3d44adf>:0 at SaveRestore.SpawnMapEntities (System.Collections.Generic.List`1[T] entities) [0x0003d] in <2be1c222040645469e3d0dc0f3d44adf>:0 at ServerMgr.Initialize (System.Boolean loadSave, System.String saveFile, System.Boolean allowOutOfDateSaves, System.Boolean skipInitialSpawn) [0x00096] in <2be1c222040645469e3d0dc0f3d44adf>:0 at Bootstrap+<StartServer>d__21.MoveNext () [0x0030c] in <2be1c222040645469e3d0dc0f3d44adf>:0 at UnityEngine.SetupCoroutine.InvokeMoveNext (System.Collections.IEnumerator enumerator, System.IntPtr returnValueAddress) [0x00026] in <9b9363fdd7ce4d3aa81e4c2f9c1be714>:0

I don't think it's related to this plugin. Looks like something is wrong with your server installation, like mismatched assemblies (incompatible versions of the Rust.Data.dll and Assembly-CSharp.dll). I suggest reinstalling Rust and the mod framework.

thank you.