It wont open

[Former user]

version 6.8 When i try to open up launchbox it pops up an error, this happens every time i try to open it. This is the Errror : System.ArgumentException: An item with the same key has already been added. at System.ThrowHelper.ThrowArgumentException(ExceptionResource resource) at System.Collections.Generic.Dictionary`2.Insert(TKey key, TValue value, Boolean add) at () at LaunchBox.Search.LocalDb.GetPlatforms() at (String , Boolean ) at LaunchBox.Search.LocalDb.GetValidPlatformName(String name, Boolean officialOnly) at (String ) at LaunchBox.Search.LocalDb.GetPlatform(String name) at (DataManager ) at LaunchBox.Data.DataManager.AddMissingPlatforms() at (DataManager , Boolean ) at LaunchBox.Data.DataManager.Load(Boolean settingsOnly) at LaunchBox.Data.DataManager..ctor(Boolean bare, Boolean settingsOnly) at (String[] ) at LaunchBox.Program.Main(String[] args)