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Rendering Failed


Using minecraft 1.6.6 (with the industrial craft mod), everytime I try to load-up and render a map, i get this error message.
Rendering failed: Une ou plusieur erreurs se sont produites.
An error report has been saved as .....
Here's the error report i get :
MTS version: 1.5.4097.39323
Failure occurred: 26/03/2011 14:05
Operating system: Microsoft Windows NT 6.1.7600.0 (64-bit)
CLR version: 4.0.30319.1
Please report what you did to cause this bug at, attaching this file to the report.
System.IO.DirectoryNotFoundException: Could not find a part of the path 'C:\Users\Dave\AppData\Roaming.minecraft\saves\World1\region\'.
at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
at System.IO.FileSystemEnumerableIterator1.CommonInit()
at System.IO.FileSystemEnumerableIterator
1..ctor(String path, String originalUserPath, String searchPattern, SearchOption searchOption, SearchResultHandler`1 resultHandler)
at System.IO.Directory.InternalGetFileDirectoryNames(String path, String userPathOriginal, String searchPattern, Boolean includeFiles, Boolean includeDirs, SearchOption searchOption)
at System.IO.Directory.InternalGetDirectories(String path, String searchPattern, SearchOption searchOption)
at MTS.WorldRenderer.getFolder(String folder, Boolean hell)
at MTS.WorldRenderer.renderWorld(RenderSettings settings, BackgroundWorker worker)
at MTSGui.MainWindow.RendererWork(Object sender, DoWorkEventArgs e)
at System.ComponentModel.BackgroundWorker.WorkerThreadStart(Object argument)
As extra informations, know that it is a multiplayer server in which about 5-9 players have been building left and right, near and far.
Thank you for your time.