Hiya! Started getting this today after being able to play before 

NotImplementedException: The game creation process has failed.
Amplitude.Unity.Game.GameException: The game creation has failed. ---> WorldGeneratorProcessException: The world generator process has encountered an error: [WorldGenerator][Exception] The world generator has encountered an exception: [InnerException] System.IO.IOException: The process cannot access the file because it is being used by another process.

   at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)

   at System.IO.File.InternalMove(String sourceFileName, String destFileName, Boolean checkHost)

   at ICSharpCode.SharpZipLib.Zip.DiskArchiveStorage.ConvertTemporaryToFinal()

   at ICSharpCode.SharpZipLib.Zip.ZipFile.RunUpdates()

   at ICSharpCode.SharpZipLib.Zip.ZipFile.CommitUpdate()

   at Amplitude.IO.Archive.Add(String fileName, MemoryStream inputStream, CompressionMethod compressionMethod)

   at Amplitude.Utilities.Maps.Atlas.Serialize(Archive archive)

   at Amplitude.WorldGenerator.World.WorldAtlasExporter.Execute(Object context)

   at Amplitude.WorldGenerator.Tasks.TaskManager.Run(List`1 tasks, Object context)

   at Amplitude.WorldGenerator.Program.Main(String[] args)


  at WorldGenerator+<StartProcess>c__Iterator2A4.MoveNext () [0x00000] in <filename unknown>:0

  at Amplitude.Coroutine.Run () [0x00000] in <filename unknown>:0

  at Amplitude.Coroutine+<EnumerableRun>c__IteratorA4.MoveNext () [0x00000] in <filename unknown>:0

  --- End of inner exception stack trace ---
--------------------------------------------------------------------------------
GameClientState_LaunchGame.GameService_CreateGameComplete (System.Object sender, Amplitude.Unity.Game.CreateGameCompleteEventArgs e)
Amplitude.Unity.Game.GameManager.OnCreateGameComplete (Amplitude.Unity.Game.CreateGameCompleteEventArgs e)
Amplitude.Unity.Game.GameManager.CreateGameAsync_CoroutineExceptionHandler (System.Object sender, Amplitude.CoroutineExceptionEventArgs args)
Amplitude.Coroutine+<EnumerableRun>c__IteratorA4.MoveNext ()
UnityEngine.SetupCoroutine.InvokeMoveNext (IEnumerator enumerator, IntPtr returnValueAddress)

--------------------------------------------------------------------------------
V1.5.1 S3  (64-bit)

Hi,

it says "The process cannot access the file because it is being used by another process."

Do you have any anti-virus solution installed ?

Could you try disabling it before launching EL ?

I was getting something similar.   Same problem below I will post my error logs.  I disabled my anti-virus Avira and relaunched and it started working for me.  Update on Avira or maybe an update on the game that is keeping it from generating the world?  I could not load a save or create a new game.

NotImplementedException: The game creation process has failed.
Amplitude.Unity.Game.GameException: The game creation has failed. ---> System.NullReferenceException: Object reference not set to an instance of an object  
at Unit.RemoveUnitAbility (Amplitude.StaticString currentAbility, Int32 level) [0x00000] in <filename unknown>:0  
at Unit.VerifyUnitAbilities () [0x00000] in <filename unknown>:0  
at DepartmentOfDefense.ReadUnit (Amplitude.Xml.XmlReader reader, IUnitDesignDatabase unitDesignDatabase) [0x00000] in <filename unknown>:0  
at Garrison.ReadXml (Amplitude.Xml.XmlReader reader) [0x00000] in <filename unknown>:0  
at MinorEmpireGarrison.ReadXml (Amplitude.Xml.XmlReader reader) [0x00000] in <filename unknown>:0  
at Village.ReadXml (Amplitude.Xml.XmlReader reader) [0x00000] in <filename unknown>:0  
at Amplitude.Xml.XmlReader.ReadElementSerializable[Village] (.Village& serializable) [0x00000] in <filename unknown>:0  
at BarbarianCouncil.ReadXml (Amplitude.Xml.XmlReader reader) [0x00000] in <filename unknown>:0  
at Amplitude.Xml.XmlReader.ReadElementSerializable[Agency] (Amplitude.Unity.Game.Agency& serializable) [0x00000] in <filename unknown>:0  
at Amplitude.Unity.Game.Empire.ReadXml (Amplitude.Xml.XmlReader reader) [0x00000] in <filename unknown>:0  
at Empire.ReadXml (Amplitude.Xml.XmlReader reader) [0x00000] in <filename unknown>:0  
at MinorEmpire.ReadXml (Amplitude.Xml.XmlReader reader) [0x00000] in <filename unknown>:0  
at Amplitude.Xml.XmlReader.ReadElementSerializable[Empire] (.Empire& serializable) [0x00000] in <filename unknown>:0  
at Game.ReadXml (Amplitude.Xml.XmlReader reader) [0x00000] in <filename unknown>:0  
at Game+<LoadGame>c__Iterator28C.MoveNext () [0x00000] in <filename unknown>:0  
at Amplitude.Coroutine.Run () [0x00000] in <filename unknown>:0  
at Amplitude.Coroutine+<EnumerableRun>c__IteratorA4.MoveNext () [0x00000] in <filename unknown>:0  
--- End of inner exception stack trace ---
--------------------------------------------------------------------------------
GameClientState_LaunchGame.GameService_CreateGameComplete (System.Object sender, Amplitude.Unity.Game.CreateGameCompleteEventArgs e)
Amplitude.Unity.Game.GameManager.OnCreateGameComplete (Amplitude.Unity.Game.CreateGameCompleteEventArgs e)
Amplitude.Unity.Game.GameManager.CreateGameAsync_CoroutineExceptionHandler (System.Object sender, Amplitude.CoroutineExceptionEventArgs args)
Amplitude.Coroutine+<EnumerableRun>c__IteratorA4.MoveNext ()
UnityEngine.SetupCoroutine.InvokeMoveNext (IEnumerator enumerator, IntPtr returnValueAddress)

--------------------------------------------------------------------------------
V1.5.1 S3  (64-bit)

NotImplementedException: The game creation process has failed.
Amplitude.Unity.Game.GameException: The game creation has failed. ---> System.ArgumentNullException: Argument cannot be null.  
Parameter name: map  
at WorldPositionExtension.GetValue[District] (Amplitude.Utilities.Maps.GridMap`1 map, WorldPosition worldPosition) [0x00000] in <filename unknown>:0  
at WorldPositionning.GetDistrict (WorldPosition worldPosition) [0x00000] in <filename unknown>:0  
at DepartmentOfTheInterior.CheckBesiegerArmyStatus (.Army army) [0x00000] in <filename unknown>:0  
at DepartmentOfDefense.AddArmy (.Army army) [0x00000] in <filename unknown>:0  
at DepartmentOfDefense.CreateArmy (GameEntityGUID armyGUID, .UnitDescriptor[] unitDescriptors, WorldPosition position, .Army& army, Boolean onlyDefaultUnitDesign, Boolean allowEmpty) [0x00000] in <filename unknown>:0  
at Game.ExecuteFactionTraitCommands (.Empire empire, .FactionTrait trait) [0x00000] in <filename unknown>:0  
at Game+<LoadGame>c__Iterator28C.MoveNext () [0x00000] in <filename unknown>:0  
at Amplitude.Coroutine.Run () [0x00000] in <filename unknown>:0  
at Amplitude.Coroutine+<EnumerableRun>c__IteratorA4.MoveNext () [0x00000] in <filename unknown>:0  
--- End of inner exception stack trace ---
--------------------------------------------------------------------------------
GameClientState_LaunchGame.GameService_CreateGameComplete (System.Object sender, Amplitude.Unity.Game.CreateGameCompleteEventArgs e)
Amplitude.Unity.Game.GameManager.OnCreateGameComplete (Amplitude.Unity.Game.CreateGameCompleteEventArgs e)
Amplitude.Unity.Game.GameManager.CreateGameAsync_CoroutineExceptionHandler (System.Object sender, Amplitude.CoroutineExceptionEventArgs args)
Amplitude.Coroutine+<EnumerableRun>c__IteratorA4.MoveNext ()
UnityEngine.SetupCoroutine.InvokeMoveNext (IEnumerator enumerator, IntPtr returnValueAddress)

--------------------------------------------------------------------------------
V1.5.1 S3  (64-bit)

Hope this helps others.

Then after one load it started again and now my anti-virus  Avira is turned off. 

NotImplementedException: The game creation process has failed.
Amplitude.Unity.Game.GameException: The game creation has failed. ---> System.ArgumentNullException: Argument cannot be null.  
Parameter name: map  
at WorldPositionExtension.GetValue[District] (Amplitude.Utilities.Maps.GridMap`1 map, WorldPosition worldPosition) [0x00000] in <filename unknown>:0  
at WorldPositionning.GetDistrict (WorldPosition worldPosition) [0x00000] in <filename unknown>:0  
at DepartmentOfTheInterior.CheckBesiegerArmyStatus (.Army army) [0x00000] in <filename unknown>:0  
at DepartmentOfDefense.AddArmy (.Army army) [0x00000] in <filename unknown>:0  
at DepartmentOfDefense.CreateArmy (GameEntityGUID armyGUID, .UnitDescriptor[] unitDescriptors, WorldPosition position, .Army& army, Boolean onlyDefaultUnitDesign, Boolean allowEmpty) [0x00000] in <filename unknown>:0  
at Game.ExecuteFactionTraitCommands (.Empire empire, .FactionTrait trait) [0x00000] in <filename unknown>:0  
at Game+<LoadGame>c__Iterator28C.MoveNext () [0x00000] in <filename unknown>:0  
at Amplitude.Coroutine.Run () [0x00000] in <filename unknown>:0  
at Amplitude.Coroutine+<EnumerableRun>c__IteratorA4.MoveNext () [0x00000] in <filename unknown>:0  
--- End of inner exception stack trace ---
--------------------------------------------------------------------------------
GameClientState_LaunchGame.GameService_CreateGameComplete (System.Object sender, Amplitude.Unity.Game.CreateGameCompleteEventArgs e)
Amplitude.Unity.Game.GameManager.OnCreateGameComplete (Amplitude.Unity.Game.CreateGameCompleteEventArgs e)
Amplitude.Unity.Game.GameManager.CreateGameAsync_CoroutineExceptionHandler (System.Object sender, Amplitude.CoroutineExceptionEventArgs args)
Amplitude.Coroutine+<EnumerableRun>c__IteratorA4.MoveNext ()
UnityEngine.SetupCoroutine.InvokeMoveNext (IEnumerator enumerator, IntPtr returnValueAddress)

--------------------------------------------------------------------------------
V1.5.1 S3  (64-bit)