7d2d Server "Incorrect region file header" error

Exception: Incorrect region file header! d:\home\sid_3202438\sevenDaysExperimental\saves/Liyuwoki County/TigaraCuCafea\Region/r.-2.-6.7rg
  at RegionFile.Get (System.String dir, System.Int32 rX, System.Int32 rZ) [0x00086] in <8aa353f1b2f74de7a462db7ce1e4f74a>:0
  at RegionFileAccessMultipleChunks.GetRFC (System.Int32 regionX, System.Int32 regionZ, System.String _dir) [0x0005c] in <8aa353f1b2f74de7a462db7ce1e4f74a>:0
  at RegionFileAccessMultipleChunks.ReadDirectory (System.String _dir, System.Collections.Generic.HashSetLong _chunksList) [0x00088] in <8aa353f1b2f74de7a462db7ce1e4f74a>:0
  at RegionFileManager..ctor (System.String _loadDirectory, System.String _saveDirectory, System.Int32 _maxChunksInCache, System.Boolean _bSaveOnChunkDrop) [0x000a6] in <8aa353f1b2f74de7a462db7ce1e4f74a>:0
  at ChunkProviderGenerateWorldFromRaw+<Init>d__16.MoveNext () [0x009e3] in <8aa353f1b2f74de7a462db7ce1e4f74a>:0
  at UnityEngine.SetupCoroutine.InvokeMoveNext (System.Collections.IEnumerator enumerator, System.IntPtr returnValueAddress) [0x00026] in <544fca0986d54eca88fc7c56e2a8b4b4>:0