This problem is caused by a corrupted settings file.  You can delete the corrupt file by following the steps below.

  1. Type or paste: %APPDATA%/XLShareBoard into the File Explorer or the Windows Run/Search bar and press enter.
  2. That should open the folder that contains the XL Share Board settings file.
  3. Select and delete the "settings" file.
  4. XL Share Board will recreate the settings file when you run it again.