All of a sudden I am getting this error when loading theme."Object reference not set to an instance of an object"
What could be causing this?

Can you please post the log file?

Error: 5/24/2022 4:46:28 PM (UTC)
ATVO version: 1.43.3.0
Themes SDK version: 1.33.0.0
Theme version: none

Unhandled exception
System.NullReferenceException: Object reference not set to an instance of an object.
at ATVO.ThemeEditor.Scripting.ScriptError..ctor(DiagnosticWrapper wrapper) in D:\Users\Nick\Documents\Programming\ATVO\Appgineer.in-TV-Overlay-for-iRacing\ATVO.ThemeEditor\Scripting\ScriptError.cs:line 22
at ATVO.ThemeEditor.Scripting.DotNET.DotNetScriptCompiler`1.<>c.<Compile>b__3_1(DiagnosticWrapper f) in D:\Users\Nick\Documents\Programming\ATVO\Appgineer.in-TV-Overlay-for-iRacing\ATVO.ThemeEditor\Scripting\DotNET\DotNetScriptCompiler.cs:line 47
at System.Linq.Enumerable.WhereSelectListIterator`2.MoveNext()
at System.Collections.Generic.List`1.InsertRange(Int32 index, IEnumerable`1 collection)
at ATVO.ThemeEditor.Scripting.DotNET.DotNetScriptCompiler`1.Compile(Script script, String source) in D:\Users\Nick\Documents\Programming\ATVO\Appgineer.in-TV-Overlay-for-iRacing\ATVO.ThemeEditor\Scripting\DotNET\DotNetScriptCompiler.cs:line 47
at ATVO.ThemeEditor.ThemeModels.Script.Compile(Boolean force) in D:\Users\Nick\Documents\Programming\ATVO\Appgineer.in-TV-Overlay-for-iRacing\ATVO.ThemeEditor\ThemeModels\Script.cs:line 159
at ATVO.ThemeEditor.ThemeModels.Serialization.ThemeSerializer.ReadTheme(XDocument doc, Theme theme) in D:\Users\Nick\Documents\Programming\ATVO\Appgineer.in-TV-Overlay-for-iRacing\ATVO.ThemeEditor\ThemeModels\Serialization\ThemeSerializer.cs:line 185
at ATVO.ThemeEditor.ThemeModels.Serialization.ThemeSerializer.LoadTheme(String path, String encryptedFilepath, Boolean isInEditor) in D:\Users\Nick\Documents\Programming\ATVO\Appgineer.in-TV-Overlay-for-iRacing\ATVO.ThemeEditor\ThemeModels\Serialization\ThemeSerializer.cs:line 95
at ATVO.ThemeEditor.ViewModels.MainMenuViewModel.OnOpenThemeInternal(String path) in D:\Users\Nick\Documents\Programming\ATVO\Appgineer.in-TV-Overlay-for-iRacing\ATVO.ThemeEditor\ViewModels\MainMenuViewModel.cs:line 336
at ATVO.ThemeEditor.ViewModels.MainMenuViewModel.OnOpenTheme(String path, Boolean showDialog) in D:\Users\Nick\Documents\Programming\ATVO\Appgineer.in-TV-Overlay-for-iRacing\ATVO.ThemeEditor\ViewModels\MainMenuViewModel.cs:line 327
at MS.Internal.Commands.CommandHelpers.CriticalExecuteCommandSource(ICommandSource commandSource, Boolean userInitiated)
at System.Windows.Controls.MenuItem.InvokeClickAfterRender(Object arg)
at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)