Fatal Error Help

[ssor_serpent]

hello when i start my server now i get this problem

RunUO - [www.runuo.com] Version 1.0.0, Build 36918
Scripts: Compiling C# scripts...done (0 errors, 0 warnings)
Scripts: Compiling VB.net scripts...no files found.
Scripts: Verifying...done (2787 items, 731 mobiles)
ACC Registered: Server.ACC.CM.CentralMemory
ACC Registered: Server.ACC.PG.PGSystem
World: Loading...Error:
System.ArgumentOutOfRangeException: Index was out of range.  Must be non-negativ
e and less than the size of the collection.
Parameter name: index
   at System.Collections.ArrayList.get_Item(Int32 index)
   at Server.World.Load()
   at Server.ScriptCompiler.Compile(Boolean debug)
   at Server.Core.Main(String[] args)
This exception is fatal, press return to exit

[Aenima]

Your last save is corrupted. Load a backup.