System.IO.IOException The process cannot access the file because it is being used by another process. Void WinIOError(Int32, System.String)

The App is throwing the Exception "System.IO.IOException The process cannot access the file because it is being used by another process. Void WinIOError(Int32, System.String)"  ,  when Moving a File from one folder to the other.

The code is below.

foreach (var item in fileList)

{

Log.Info("Moving " + item + " to the XXXXX folder.");
var target = Path.Combine(
config.FTPHistoryFolderLocation,
Path.GetFileNameWithoutExtension(item) + "_TYM" + DateTime.Now.ToString("MMddyyyy_HHmmssffff") + Path.GetExtension(item));

File.Move(item, target);
}

 Please suggest if this could occur due to lack of space in the folder.