System.Management.Automation.ParameterBindingValidationException: Cannot bind argument to parameter 'WalkThru' because it is null. at System.Management.Automation.ParameterBinderBase.ValidateNullOrEmptyArgument(CommandParameterInternal parameter, CompiledCommandParameter parameterMetadata, Type argumentType, Object parameterValue, Boolean recurseIntoCollections) at System.Management.Automation.ParameterBinderBase.BindParameter(CommandParameterInternal parameter, CompiledCommandParameter parameterMetadata, ParameterBindingFlags flags) at System.Management.Automation.CmdletParameterBinderController.BindParameter(CommandParameterInternal argument, MergedCompiledCommandParameter parameter, ParameterBindingFlags flags) at System.Management.Automation.CmdletParameterBinderController.BindParameter(UInt32 parameterSets, CommandParameterInternal argument, MergedCompiledCommandParameter parameter, ParameterBindingFlags flags) at System.Management.Automation.CmdletParameterBinderController.BindParameters(UInt32 parameterSets, Collection`1 arguments, CommandMetadata commandMetadata) at System.Management.Automation.CmdletParameterBinderController.BindCommandLineParametersNoValidation(Collection`1 arguments) at System.Management.Automation.CmdletParameterBinderController.BindCommandLineParameters(Collection`1 arguments) at System.Management.Automation.CommandProcessor.BindCommandLineParameters(CommandParameterInternal[] parameters) at System.Management.Automation.CommandProcessor.Prepare(CommandParameterInternal[] parameters) at System.Management.Automation.CommandProcessorBase.DoPrepare(CommandParameterInternal[] parameters) at System.Management.Automation.Internal.PipelineProcessor.Start(Boolean incomingStream) at System.Management.Automation.Internal.PipelineProcessor.SynchronousExecuteEnumerate(Object input, Hashtable errorResults, Boolean enumerate) At line:7 char:45 + $Name = Write-WalkthruHTML -WalkThru <<<< $walkthru -StepByStep