After update my ATVO to the latest version and try to open the application, I got this error:

Error: 08/04/2020 04:27:33 (UTC)
Unhandled exception
System.Configuration.ConfigurationErrorsException: O sistema de configuração falhou ao inicializar ---> System.Configuration.ConfigurationErrorsException: '.', valor hexadecimal 0x00, é um caractere inválido. Linha 6, posição 1. (C:\Users\Leandro\AppData\Local\appgineer.in\ATVO.exe_Url_2m4gup5u330zjl40g2b100ex0p3u2pcq\1.27.2.0\user.config line 6) ---> System.Xml.XmlException: '.', valor hexadecimal 0x00, é um caractere inválido. Linha 6, posição 1.
em System.Xml.XmlTextReaderImpl.Throw(Exception e)
em System.Xml.XmlTextReaderImpl.Throw(String res, String[] args)
em System.Xml.XmlTextReaderImpl.ParseText(Int32& startPos, Int32& endPos, Int32& outOrChars)
em System.Xml.XmlTextReaderImpl.ParseText()
em System.Xml.XmlTextReaderImpl.ParseElementContent()
em System.Xml.XmlTextReaderImpl.Read()
em System.Xml.XmlTextReader.Read()
em System.Configuration.XmlUtil.StrictReadToNextElement(ExceptionAction action)
em System.Configuration.BaseConfigurationRecord.ScanFactoriesRecursive(XmlUtil xmlUtil, String parentConfigKey, Hashtable factoryList)
em System.Configuration.BaseConfigurationRecord.ScanFactoriesRecursive(XmlUtil xmlUtil, String parentConfigKey, Hashtable factoryList)
em System.Configuration.BaseConfigurationRecord.ScanFactories(XmlUtil xmlUtil)
em System.Configuration.BaseConfigurationRecord.InitConfigFromFile()
--- Fim do rastreamento de pilha de exceções internas ---
em System.Configuration.ConfigurationSchemaErrors.ThrowIfErrors(Boolean ignoreLocal)
em System.Configuration.BaseConfigurationRecord.ThrowIfParseErrors(ConfigurationSchemaErrors schemaErrors)
em System.Configuration.BaseConfigurationRecord.ThrowIfInitErrors()
em System.Configuration.ClientConfigurationSystem.OnConfigRemoved(Object sender, InternalConfigEventArgs e)
--- Fim do rastreamento de pilha de exceções internas ---
em System.Configuration.ClientConfigurationSystem.OnConfigRemoved(Object sender, InternalConfigEventArgs e)
em System.Configuration.Internal.InternalConfigRoot.OnConfigRemoved(InternalConfigEventArgs e)
em System.Configuration.Internal.InternalConfigRoot.RemoveConfigImpl(String configPath, BaseConfigurationRecord configRecord)
em System.Configuration.BaseConfigurationRecord.GetSectionRecursive(String configKey, Boolean getLkg, Boolean checkPermission, Boolean getRuntimeObject, Boolean requestIsHere, Object& result, Object& resultRuntimeObject)
em System.Configuration.BaseConfigurationRecord.GetSection(String configKey)
em System.Configuration.ClientConfigurationSystem.System.Configuration.Internal.IInternalConfigSystem.GetSection(String sectionName)
em System.Configuration.ConfigurationManager.GetSection(String sectionName)
em System.Configuration.ClientSettingsStore.ReadSettings(String sectionName, Boolean isUserScoped)
em System.Configuration.LocalFileSettingsProvider.GetPropertyValues(SettingsContext context, SettingsPropertyCollection properties)
em System.Configuration.SettingsBase.GetPropertiesFromProvider(SettingsProvider provider)
em System.Configuration.SettingsBase.GetPropertyValueByName(String propertyName)
em System.Configuration.SettingsBase.get_Item(String propertyName)
em System.Configuration.ApplicationSettingsBase.GetPropertyValue(String propertyName)
em System.Configuration.ApplicationSettingsBase.get_Item(String propertyName)
em ATVO.Properties.Settings.get_UpgradeRequired() na D:\Users\Nick\Documents\Programming\ATVO\Appgineer.in-TV-Overlay-for-iRacing\ATVO\Properties\Settings.Designer.cs:linha 31
em ATVO.App.OnStartup(StartupEventArgs e) na D:\Users\Nick\Documents\Programming\ATVO\Appgineer.in-TV-Overlay-for-iRacing\ATVO\App.xaml.cs:linha 32
em System.Windows.Application.<.ctor>b__1_0(Object unused)
em System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
em System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)


Please, how can I fix this?

Looks like your configuration/settings are somehow corrupted.

Can you going to "C:\Users\Leandro\AppData\Local\appgineer.in\", then delete all folders that start with "ATVO.exe_...."
You will lose some program settings (things like window positioning) but not your ATVO settings itself.

Yes!
It works!
Thank you Nick!

Regards

@nick why are these lines in here looking for your PC?

Error: 4/10/2020 3:41:01 PM (UTC)
Unhandled exception
System.FormatException: Index (zero based) must be greater than or equal to zero and less than the size of the argument list.
at System.Text.StringBuilder.AppendFormatHelper(IFormatProvider provider, String format, ParamsArray args)
at System.String.FormatHelper(IFormatProvider provider, String format, ParamsArray args)
at ATVO.ThemeEditor.ThemeModels.DataBindings.LapCounterDataBinding.GetData(ISessionResult s) in D:\Users\Nick\Documents\Programming\ATVO\Appgineer.in-TV-Overlay-for-iRacing\ATVO.ThemeEditor\ThemeModels\DataBindings\LapCounterDataBinding.cs:line 472
at ATVO.ThemeEditor.Data.DataSet`1.GetData(DataBindingBase bindingBase, ISimulation sim, IDataOrder order, DataClassIndex classIndex, Int32 offset) in D:\Users\Nick\Documents\Programming\ATVO\Appgineer.in-TV-Overlay-for-iRacing\ATVO.ThemeEditor.Data\DataSet.cs:line 94
at ATVO.ThemeEditor.ThemeModels.DataBinderContainer.GetBindingValue(DataBindingBase binding, DataSetBase dataset, ISimulation sim) in D:\Users\Nick\Documents\Programming\ATVO\Appgineer.in-TV-Overlay-for-iRacing\ATVO.ThemeEditor\ThemeModels\DataBinderContainer.cs:line 75
at ATVO.ThemeEditor.ThemeModels.DataBinderContainer.SetValueAndUpdate(ISimulation sim) in D:\Users\Nick\Documents\Programming\ATVO\Appgineer.in-TV-Overlay-for-iRacing\ATVO.ThemeEditor\ThemeModels\DataBinderContainer.cs:line 101
at ATVO.ThemeEditor.ThemeModels.ThemeDataUpdater.UpdateDataBinders(List`1 databinders, ISimulation sim, Boolean designMode, DebugModes debugMode, Double time, Double deltatime) in D:\Users\Nick\Documents\Programming\ATVO\Appgineer.in-TV-Overlay-for-iRacing\ATVO.ThemeEditor\ThemeModels\ThemeDataUpdater.cs:line 251
at ATVO.ThemeEditor.ThemeModels.ThemeDataUpdater.Update(ISimulation sim, Boolean designMode, DebugModes debugMode, Boolean reloadSpreadsheets) in D:\Users\Nick\Documents\Programming\ATVO\Appgineer.in-TV-Overlay-for-iRacing\ATVO.ThemeEditor\ThemeModels\ThemeDataUpdater.cs:line 56
at ATVO.Theme.Code.EditorTheme.<SimOnDataUpdatedEvent>b__29_0() in D:\Users\Nick\Documents\Programming\ATVO\Appgineer.in-TV-Overlay-for-iRacing\ATVO.Theme\Code\EditorTheme.cs:line 144
at System.Windows.Threading.DispatcherOperation.InvokeDelegateCore()
at System.Windows.Threading.DispatcherOperation.InvokeImpl()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Windows.Threading.DispatcherOperation.Wait(TimeSpan timeout)
at System.Windows.Threading.Dispatcher.InvokeImpl(DispatcherOperation operation, CancellationToken cancellationToken, TimeSpan timeout)
at System.Windows.Threading.Dispatcher.Invoke(Action callback, DispatcherPriority priority, CancellationToken cancellationToken, TimeSpan timeout)
at System.Windows.Threading.Dispatcher.Invoke(Action callback)
at ATVO.Theme.Code.EditorTheme.SimOnDataUpdatedEvent(Object sender, ISimulation simulation) in D:\Users\Nick\Documents\Programming\ATVO\Appgineer.in-TV-Overlay-for-iRacing\ATVO.Theme\Code\EditorTheme.cs:line 141
at ATVO.Data.Simulation.UpdateData() in D:\Users\Nick\Documents\Programming\ATVO\Appgineer.in-TV-Overlay-for-iRacing\ATVO.Data\Simulation.cs:line 274

:ermm: