Configuration system failed to initialize

Hello Daniel, the toolbox was working well until yesterday suddenly stop working and I received a message from Microsoft office Application that says: An unhandled exception occurred in your application. contact your administrator o the author of this document. I reinstalled the application and the error persist. Any idea what could be the problems? I copy the details of the error.

************** Exception Text **************
System.Configuration.ConfigurationErrorsException: Configuration system failed to initialize —> System.Configuration.ConfigurationErrorsException: ‘.’, hexadecimal value 0x00, is an invalid character. Line 6, position 1. (C:\Users\maria\AppData\Local\Microsoft_Corporation\XLToolboxForExcel.vsto_vs_Path_jojpsvsna1vaszvd35jsryd0vnvv001i\16.0.11929.20776\user.config line 6) —> System.Xml.XmlException: ‘.’, hexadecimal value 0x00, is an invalid character. Line 6, position 1.
at System.Xml.XmlTextReaderImpl.Throw(Exception e)
at System.Xml.XmlTextReaderImpl.Throw(String res, String[] args)
at System.Xml.XmlTextReaderImpl.ParseText(Int32& startPos, Int32& endPos, Int32& outOrChars)
at System.Xml.XmlTextReaderImpl.ParseText()
at System.Xml.XmlTextReaderImpl.ParseElementContent()
at System.Xml.XmlTextReaderImpl.Read()
at System.Xml.XmlTextReader.Read()
at System.Configuration.XmlUtil.StrictReadToNextElement(ExceptionAction action)
at System.Configuration.BaseConfigurationRecord.ScanFactoriesRecursive(XmlUtil xmlUtil, String parentConfigKey, Hashtable factoryList)
at System.Configuration.BaseConfigurationRecord.ScanFactoriesRecursive(XmlUtil xmlUtil, String parentConfigKey, Hashtable factoryList)
at System.Configuration.BaseConfigurationRecord.ScanFactories(XmlUtil xmlUtil)
at System.Configuration.BaseConfigurationRecord.InitConfigFromFile()
— End of inner exception stack trace —
at System.Configuration.ConfigurationSchemaErrors.ThrowIfErrors(Boolean ignoreLocal)
at System.Configuration.BaseConfigurationRecord.ThrowIfParseErrors(ConfigurationSchemaErrors schemaErrors)
at System.Configuration.BaseConfigurationRecord.ThrowIfInitErrors()
at System.Configuration.ClientConfigurationSystem.OnConfigRemoved(Object sender, InternalConfigEventArgs e)
— End of inner exception stack trace —
at System.Configuration.ConfigurationManager.PrepareConfigSystem()
at System.Configuration.ConfigurationManager.RefreshSection(String sectionName)
at System.Configuration.ClientSettingsStore.ReadSettings(String sectionName, Boolean isUserScoped)
at System.Configuration.LocalFileSettingsProvider.GetPropertyValues(SettingsContext context, SettingsPropertyCollection properties)
at System.Configuration.SettingsBase.GetPropertiesFromProvider(SettingsProvider provider)
at System.Configuration.SettingsBase.GetPropertyValueByName(String propertyName)
at System.Configuration.SettingsBase.get_Item(String propertyName)
at System.Configuration.ApplicationSettingsBase.GetPropertyValue(String propertyName)
at System.Configuration.ApplicationSettingsBase.get_Item(String propertyName)
at XLToolbox.Properties.Settings.get_AppDataFolder() in X:\Code\xltoolbox\NG\XLToolbox\Properties\Settings.Designer.cs:line 121
at XLToolboxForExcel.ThisAddIn.ThisAddIn_Startup(Object sender, EventArgs e) in X:\Code\xltoolbox\NG\XLToolboxForExcel\ThisAddIn.cs:line 49
at Microsoft.Office.Tools.AddInImpl.OnStartup()
at Microsoft.Office.Tools.AddInImpl.AddInExtensionImpl.Microsoft.Office.Tools.EntryPoint.OnStartup()
at Microsoft.Office.Tools.AddInBase.OnStartup()
at XLToolboxForExcel.ThisAddIn.FinishInitialization() in X:\Code\xltoolbox\NG\XLToolboxForExcel\ThisAddIn.Designer.cs:line 59
at Microsoft.Office.Tools.AddInBase.Microsoft.Office.Tools.EntryPoint.FinishInitialization()
at Microsoft.VisualStudio.Tools.Office.Runtime.DomainCreator.ExecuteCustomization.ExecutePhase(ExecutionPhases executionPhases)
at Microsoft.VisualStudio.Tools.Office.Runtime.DomainCreator.ExecuteCustomization.Microsoft.VisualStudio.Tools.Office.Runtime.Interop.IExecuteCustomization2.ExecuteEntryPoints()

************** Loaded Assemblies **************
mscorlib
Assembly Version: 4.0.0.0
Win32 Version: 4.8.4180.0 built by: NET48REL1LAST_B
CodeBase: file:///C:/Windows/Microsoft.NET/Framework/v4.0.30319/mscorlib.dll

Microsoft.VisualStudio.Tools.Office.Runtime
Assembly Version: 10.0.0.0
Win32 Version: 10.0.60828.0
CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/Microsoft.VisualStudio.Tools.Office.Runtime/v4.0_10.0.0.0__b03f5f7f11d50a3a/Microsoft.VisualStudio.Tools.Office.Runtime.dll

System.Core
Assembly Version: 4.0.0.0
Win32 Version: 4.8.4180.0 built by: NET48REL1LAST_B
CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/System.Core/v4.0_4.0.0.0__b77a5c561934e089/System.Core.dll

System
Assembly Version: 4.0.0.0
Win32 Version: 4.8.4001.0 built by: NET48REL1LAST_C
CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/System/v4.0_4.0.0.0__b77a5c561934e089/System.dll

System.Configuration
Assembly Version: 4.0.0.0
Win32 Version: 4.8.3752.0 built by: NET48REL1
CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/System.Configuration/v4.0_4.0.0.0__b03f5f7f11d50a3a/System.Configuration.dll

System.Xml
Assembly Version: 4.0.0.0
Win32 Version: 4.8.3752.0 built by: NET48REL1
CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/System.Xml/v4.0_4.0.0.0__b77a5c561934e089/System.Xml.dll

System.Security
Assembly Version: 4.0.0.0
Win32 Version: 4.8.3752.0 built by: NET48REL1
CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/System.Security/v4.0_4.0.0.0__b03f5f7f11d50a3a/System.Security.dll

Microsoft.VisualStudio.Tools.Applications.Hosting
Assembly Version: 10.0.0.0
Win32 Version: 10.0.60828.0
CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/Microsoft.VisualStudio.Tools.Applications.Hosting/v4.0_10.0.0.0__b03f5f7f11d50a3a/Microsoft.VisualStudio.Tools.Applications.Hosting.dll

Microsoft.VisualStudio.Tools.Applications.Runtime
Assembly Version: 10.0.0.0
Win32 Version: 10.0.60828.0
CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/Microsoft.VisualStudio.Tools.Applications.Runtime/v4.0_10.0.0.0__b03f5f7f11d50a3a/Microsoft.VisualStudio.Tools.Applications.Runtime.dll

System.Deployment
Assembly Version: 4.0.0.0
Win32 Version: 4.8.3752.0 built by: NET48REL1
CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/System.Deployment/v4.0_4.0.0.0__b03f5f7f11d50a3a/System.Deployment.dll

Microsoft.VisualStudio.Tools.Applications.ServerDocument
Assembly Version: 10.0.0.0
Win32 Version: 10.0.60828.0
CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/Microsoft.VisualStudio.Tools.Applications.ServerDocument/v4.0_10.0.0.0__b03f5f7f11d50a3a/Microsoft.VisualStudio.Tools.Applications.ServerDocument.dll

System.Windows.Forms
Assembly Version: 4.0.0.0
Win32 Version: 4.8.4150.0 built by: NET48REL1LAST_C
CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/System.Windows.Forms/v4.0_4.0.0.0__b77a5c561934e089/System.Windows.Forms.dll

System.Drawing
Assembly Version: 4.0.0.0
Win32 Version: 4.8.3752.0 built by: NET48REL1
CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/System.Drawing/v4.0_4.0.0.0__b03f5f7f11d50a3a/System.Drawing.dll

System.Xml.Linq
Assembly Version: 4.0.0.0
Win32 Version: 4.8.3752.0 built by: NET48REL1
CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/System.Xml.Linq/v4.0_4.0.0.0__b77a5c561934e089/System.Xml.Linq.dll

Microsoft.Office.Tools
Assembly Version: 10.0.0.0
Win32 Version: 10.0.60828.0
CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/Microsoft.Office.Tools/v4.0_10.0.0.0__b03f5f7f11d50a3a/Microsoft.Office.Tools.dll

Microsoft.Office.Tools.Excel.Implementation
Assembly Version: 10.0.0.0
Win32 Version: 10.0.60828.0
CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/Microsoft.Office.Tools.Excel.Implementation/v4.0_10.0.0.0__b03f5f7f11d50a3a/Microsoft.Office.Tools.Excel.Implementation.dll

Microsoft.Office.Tools.Common.Implementation
Assembly Version: 10.0.0.0
Win32 Version: 10.0.60828.0
CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/Microsoft.Office.Tools.Common.Implementation/v4.0_10.0.0.0__b03f5f7f11d50a3a/Microsoft.Office.Tools.Common.Implementation.dll

Microsoft.Office.Tools.Common
Assembly Version: 10.0.0.0
Win32 Version: 10.0.60828.0
CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/Microsoft.Office.Tools.Common/v4.0_10.0.0.0__b03f5f7f11d50a3a/Microsoft.Office.Tools.Common.dll

Microsoft.Office.Tools.Excel
Assembly Version: 10.0.0.0
Win32 Version: 10.0.60828.0
CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/Microsoft.Office.Tools.Excel/v4.0_10.0.0.0__b03f5f7f11d50a3a/Microsoft.Office.Tools.Excel.dll

XLToolboxForExcel
Assembly Version: 7.3.4.0
Win32 Version: 7.3.4.0
CodeBase: file:///C:/Users/maria/AppData/Roaming/XLToolbox/XLToolboxForExcel.DLL

Microsoft.Office.Tools.Common.v4.0.Utilities
Assembly Version: 10.0.0.0
Win32 Version: 10.0.30319.1
CodeBase: file:///C:/Users/maria/AppData/Roaming/XLToolbox/Microsoft.Office.Tools.Common.v4.0.Utilities.DLL

XLToolbox
Assembly Version: 7.3.4.0
Win32 Version: 7.3.4.0
CodeBase: file:///C:/Users/maria/AppData/Roaming/XLToolbox/XLToolbox.DLL

NLog
Assembly Version: 4.0.0.0
Win32 Version: 4.5.11.8645
CodeBase: file:///C:/Users/maria/AppData/Roaming/XLToolbox/NLog.DLL

Bovender
Assembly Version: 0.18.0.0
Win32 Version: 0.18.0.0
CodeBase: file:///C:/Users/maria/AppData/Roaming/XLToolbox/Bovender.DLL

WindowsBase
Assembly Version: 4.0.0.0
Win32 Version: 4.8.4180.0 built by: NET48REL1LAST_B
CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/WindowsBase/v4.0_4.0.0.0__31bf3856ad364e35/WindowsBase.dll

PresentationFramework
Assembly Version: 4.0.0.0
Win32 Version: 4.8.4180.0
CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/PresentationFramework/v4.0_4.0.0.0__31bf3856ad364e35/PresentationFramework.dll

PresentationCore
Assembly Version: 4.0.0.0
Win32 Version: 4.8.4180.0 built by: NET48REL1LAST_B
CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_32/PresentationCore/v4.0_4.0.0.0__31bf3856ad364e35/PresentationCore.dll

System.Xaml
Assembly Version: 4.0.0.0
Win32 Version: 4.8.4180.0 built by: NET48REL1LAST_B
CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/System.Xaml/v4.0_4.0.0.0__b77a5c561934e089/System.Xaml.dll