Unhandled.Exception - Object reference not set

CFSM was working fine then today got an error.  Can anyone help with this?

Running as admin, tried uninstalling/clean install of CFSM.

Typical part of the debug .log.

[2023/12/26 19:18:14]: ==== This is the start of a new CFSM run log =====
[2023/12/26 19:18:14]: Validated RS2014 Installation Directory: C:\Program Files (x86)\Steam\steamapps\common\Rocksmith2014\
[2023/12/26 19:18:14]: <WARNING> 'Auto Quarantine' is disabled ...
[2023/12/26 19:18:14]: GetVersionInfo made a good connection with the server ...
[2023/12/26 19:18:14]: CustomsForgeSongManager.exe [1.6.0.3] does not need updating ...
[2023/12/26 19:18:15]: + CustomsForge Song Manager (v1.6.0.3 - PC BUILD)
[2023/12/26 19:18:15]: + OS Microsoft Windows NT 6.2.9200.0 (64 bit)
[2023/12/26 19:18:15]: + .NET Framework (v4.0.30319.42000)
[2023/12/26 19:18:15]: + CultureInfo (en-US)
[2023/12/26 19:18:15]: + Current Local DateTime [12/26/2023 7:18:15 PM]
[2023/12/26 19:18:15]: + Current UTC DateTime [12/27/2023 12:18:15 AM]
[2023/12/26 19:18:15]: + RocksmithToolkitLib (v2.9.2.1-4fe239f9) [2/27/2020 6:35:45 PM]
[2023/12/26 19:18:15]: + Dynamic Difficulty Creator (v3.6)
[2023/12/26 19:18:15]: + App.config Status (Load Successful)
[2023/12/26 19:18:15]: + System Display DPI Setting (96)
[2023/12/26 19:18:15]: + System Display Screen Scale Factor (125%)
[2023/12/26 19:18:15]: Populating SongManager GUI ...
[2023/12/26 19:18:15]: Loaded File: appSettings.xml
[2023/12/26 19:18:15]: Loaded File: dgvSongsMaster.xml
[2023/12/26 19:18:15]: Loaded File: songsInfo.xml
[2023/12/26 19:18:15]: Performing quick rescan of song collection ...
[2023/12/26 19:18:15]: Raw songs count: 802
[2023/12/26 19:18:16]: Finished parsing took: 00:00:00.0889580
[2023/12/26 19:18:17]: Saved File: songsInfo.xml
[2023/12/26 19:18:17]: <ERROR> Unhandled.Exception:
Source: CustomsForgeSongManager
Target: Void PopulateTagger()
System.NullReferenceException: Object reference not set to an instance of an object.
   at CustomsForgeSongManager.UControls.SongManager.PopulateTagger()
   at CustomsForgeSongManager.UControls.SongManager..ctor()
   at CustomsForgeSongManager.DataObjects.Globals.get_SongManager()
   at CustomsForgeSongManager.Forms.frmMain.LoadSongManager()
   at CustomsForgeSongManager.Forms.frmMain..ctor(DLogger myLog)
   at CustomsForgeSongManager.Program.RunApp()
   at CustomsForgeSongManager.Program.Main()