I just started getting this error. Would removing all of the newst beta fix it?

An unhandled exception has occurred in XviD4PSP v5.10.250.0!
Source:
PresentationFramework
Exception:
Cannot create instance of 'MainWindow' defined in assembly 'XviD4PSP, Version=5.10.250.0, Culture=neutral, PublicKeyToken=null'. Exception has been thrown by the target of an invocation. Error in markup file 'XviD4PSP;component/windows/MainWindow.xaml'.
Stack trace:
at System.Windows.Markup.XamlParseException.ThrowExce ption(String message, Exception innerException, Int32 lineNumber, Int32 linePosition, Uri baseUri, XamlObjectIds currentXamlObjectIds, XamlObjectIds contextXamlObjectIds, Type objectType)
at System.Windows.Markup.XamlParseException.ThrowExce ption(ParserContext parserContext, Int32 lineNumber, Int32 linePosition, String message, Exception innerException)
at System.Windows.Markup.BamlRecordReader.ThrowExcept ionWithLine(String message, Exception innerException)
at System.Windows.Markup.BamlRecordReader.CreateInsta nceFromType(Type type, Int16 typeId, Boolean throwOnFail)
at System.Windows.Markup.BamlRecordReader.GetElementA ndFlags(BamlElementStartRecord bamlElementStartRecord, Object& element, ReaderFlags& flags, Type& delayCreatedType, Int16& delayCreatedTypeId)
at System.Windows.Markup.BamlRecordReader.BaseReadEle mentStartRecord(BamlElementStartRecord bamlElementRecord)
at System.Windows.Markup.BamlRecordReader.ReadElement StartRecord(BamlElementStartRecord bamlElementRecord)
at System.Windows.Markup.BamlRecordReader.ReadRecord( BamlRecord bamlRecord)
at System.Windows.Markup.BamlRecordReader.Read(Boolea n singleRecord)
at System.Windows.Markup.TreeBuilderBamlTranslator.Pa rseFragment()
at System.Windows.Markup.TreeBuilder.Parse()
at System.Windows.Markup.XamlReader.LoadBaml(Stream stream, ParserContext parserContext, Object parent, Boolean closeStream)
at System.Windows.Application.LoadBamlStreamWithSyncI nfo(Stream stream, ParserContext pc)
at System.Windows.Application.LoadComponent(Uri resourceLocator, Boolean bSkipJournaledProperties)
at System.Windows.Application.DoStartup()
at System.Windows.Application.<.ctor>b__0(Object unused)
at System.Windows.Threading.ExceptionWrapper.Internal RealCall(Delegate callback, Object args, Boolean isSingleParameter)
at System.Windows.Threading.ExceptionWrapper.TryCatch When(Object source, Delegate callback, Object args, Boolean isSingleParameter, Delegate catchHandler)
Inner Exception:
System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.TypeInitializationException: The type initializer for 'System.Windows.Window' threw an exception. ---> System.TypeInitializationException: The type initializer for 'System.Windows.FrameworkElement' threw an exception. ---> System.MissingMethodException: Method not found: 'Boolean System.Double.IsPositiveInfinity(Double)'.
at System.Windows.FrameworkElement.IsWidthHeightValid (Object value)
at System.Windows.DependencyProperty.ValidateDefaultV alueCommon(Object defaultValue, Type propertyType, String propertyName, ValidateValueCallback validateValueCallback, Boolean checkThreadAffinity)
at System.Windows.DependencyProperty.ValidateMetadata DefaultValue(PropertyMetadata defaultMetadata, Type propertyType, String propertyName, ValidateValueCallback validateValueCallback)
at System.Windows.DependencyProperty.RegisterCommon(S tring name, Type propertyType, Type ownerType, PropertyMetadata defaultMetadata, ValidateValueCallback validateValueCallback)
at System.Windows.DependencyProperty.Register(String name, Type propertyType, Type ownerType, PropertyMetadata typeMetadata, ValidateValueCallback validateValueCallback)
at System.Windows.FrameworkElement..cctor()
--- End of inner exception stack trace ---
at System.Windows.Window..cctor()
--- End of inner exception stack trace ---
at System.Windows.Window..ctor()
at XviD4PSP.MainWindow..ctor() in C:\XviD4PSP\windows\MainWindow.xaml.cs:line 108
--- End of inner exception stack trace ---
at System.RuntimeTypeHandle.CreateInstance(RuntimeTyp e type, Boolean publicOnly, Boolean noCheck, Boolean& canBeCached, RuntimeMethodHandle& ctor, Boolean& bNeedSecurityCheck)
at System.RuntimeType.CreateInstanceSlow(Boolean publicOnly, Boolean fillCache)
at System.RuntimeType.CreateInstanceImpl(Boolean publicOnly, Boolean skipVisibilityChecks, Boolean fillCache)
at System.Activator.CreateInstance(Type type, Boolean nonPublic)
at System.Windows.Markup.BamlRecordReader.CreateInsta nceFromType(Type type, Int16 typeId, Boolean throwOnFail)