I originally posted in theme editor but this has to do with themes in general. Can't load themes or theme editor on the latest Beta build, here's the error code and the error prompt is attached in the reply:

Error: 11/28/2021 8:50:59 PM (UTC)
ATVO version: 1.42.2.0
Themes SDK version: 1.33.0.0
Theme version: none

Unhandled exception
System.IO.FileNotFoundException: Could not find file 'C:\Program Files (x86)\Appgineer.in\ATVO Launcher\bin\followed_bindings.csv'.
File name: 'C:\Program Files (x86)\Appgineer.in\ATVO Launcher\bin\followed_bindings.csv'
   at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
   at System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy, Boolean useLongPath, Boolean checkHost)
   at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize, FileOptions options, String msgPath, Boolean bFromProxy, Boolean useLongPath, Boolean checkHost)
   at System.IO.StreamReader..ctor(String path, Encoding encoding, Boolean detectEncodingFromByteOrderMarks, Int32 bufferSize, Boolean checkHost)
   at System.IO.StreamReader..ctor(String path, Encoding encoding)
   at System.IO.File.InternalReadAllLines(String path, Encoding encoding)
   at ATVO.ThemeEditor.Data.Extensions.DataBindingReader.ReadDescriptorsFromFile(String path) in D:\Users\Nick\Documents\Programming\ATVO\Appgineer.in-TV-Overlay-for-iRacing\ATVO.ThemeEditor.Data\Extensions\DataBindingReader.cs:line 30
   at ATVO.ThemeEditor.Data.DataSetManager.LoadDataBindingDescriptors() in D:\Users\Nick\Documents\Programming\ATVO\Appgineer.in-TV-Overlay-for-iRacing\ATVO.ThemeEditor.Data\DataSetManager.cs:line 208
   at ATVO.ThemeEditor.Data.DataSetManager.Initialize() in D:\Users\Nick\Documents\Programming\ATVO\Appgineer.in-TV-Overlay-for-iRacing\ATVO.ThemeEditor.Data\DataSetManager.cs:line 48
   at ATVO.ThemeEditor.App.OnStartup(StartupEventArgs e) in D:\Users\Nick\Documents\Programming\ATVO\Appgineer.in-TV-Overlay-for-iRacing\ATVO.ThemeEditor\App.xaml.cs:line 101
   at System.Windows.Application.<.ctor>b__1_0(Object unused)
   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)

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Having a similar issue but a little different

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Download logfile

Error: 1/11/2022 19:48:52 (UTC)
ATVO version: 1.42.4.1
Themes SDK version: 1.33.0.0
Theme version: none

Unhandled exception
YamlDotNet.Core.SyntaxErrorException: (Line: 2123, Col: 19, Idx: 45992) - (Line: 3519, Col: 1, Idx: 83003): While scanning a quoted scalar, found unexpected end of stream.
   at YamlDotNet.Core.Scanner.ScanFlowScalar(Boolean isSingleQuoted)
   at YamlDotNet.Core.Scanner.FetchFlowScalar(Boolean isSingleQuoted)
   at YamlDotNet.Core.Scanner.FetchMoreTokens()
   at YamlDotNet.Core.Scanner.MoveNextWithoutConsuming()
   at YamlDotNet.Core.Parser.GetCurrentToken()

Unfortunately something has gone wrong with the log download and I can't actually read the relevant section. My guess is something in the data is messing up our data parsing, probably a driver or team name. Could you email me the full logfile at nick.thissen@appgineering.com please? Thanks!