Error when load world

[Porama6400]

I got this error when load world

System.NullReferenceException was unhandled HResult=-2147467261 Message=Object reference not set to an instance of an object. Source=Craft.Net.Anvil StackTrace: at Craft.Net.Anvil.Level.Load(String file) at Craft.Net.Anvil.Level.LoadFrom(String directory) at Craft.Net.Anvil.Level.LoadSavedLevel(String world) at ConsoleTester.Program.Main(String[] args) in c:\users\fujitsu\documents\visual studio 2015\Projects\TestCraftNet\ConsoleTester\Program.cs:line 15 at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args) at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args) at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly() at System.Threading.ThreadHelper.ThreadStart_Context(Object state) at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state) at System.Threading.ThreadHelper.ThreadStart() InnerException:

How can i fix this?

[Porama6400]

Program.cs:15

Level l = Level.LoadSavedLevel("C:\Users\Fujitsu\Desktop\SPG\world");