Is this a error I need to be concerned about. If I type server.save in RCON I get the following........

server.save
4675833[4675833] died (Generic)
InvalidOperationException: Collection was modified; enumeration operation may not execute.
at System.Collections.Generic.HashSet`1+Enumerator[T].MoveNext () [0x00013] in <351e49e2a5bf4fd6beabb458ce2255f3>:0
at ConVar.Server.save (ConsoleSystem+Arg arg) [0x0001f] in <829d68a0c0be4d328daa4edc09da3730>:0
at ConsoleGen+<>c.<.cctor>b__2_974 (ConsoleSystem+Arg arg) [0x00000] in <829d68a0c0be4d328daa4edc09da3730>:0
at ConsoleSystem.Internal (ConsoleSystem+Arg arg) [0x0005b] in <4e8b285fe1584ba2b6672266e8f2f2ee>:0
UnityEngine.DebugLogHandler:Internal_LogException(Exception, Object)
UnityEngine.DebugLogHandler:LogException(Exception, Object)
UnityEngine.Logger:LogException(Exception, Object)
UnityEngine.Debug:LogException(Exception)
ConsoleSystem:Internal(Arg)
ConsoleSystem:Run(Option, String, Object[])
RustLinuxConsoleFix.HarmonyPatch_EnableLinuxConsole:OnConsoleMessageEvent(Object, StringEventArgs)
RustLinuxConsoleFix.ConsoleReader:OnConsoleMessage(String)
RustLinuxConsoleFix.ConsoleReader:PollConsole()
RustLinuxConsoleFix.<>c:<EnableConsole>b__0_0()
System.Threading.ThreadHelper:ThreadStart_Context(Object)
System.Threading.ExecutionContext:RunInternal(ExecutionContext, ContextCallback, Object, Boolean)
System.Threading.ExecutionContext:Run(ExecutionContext, ContextCallback, Object, Boolean)
System.Threading.ExecutionContext:Run(ExecutionContext, ContextCallback, Object)
System.Threading.ThreadHelper:ThreadStart()

You appear to be running a haromy patch called RustLinuxConsoleFix, which is likely causing an issue there.

Thanks Wulf. I will inquire about it to my provider..

Much appreciated.