Component initialization throws a null-reference exception

Question

I have a menu item in a large program that opens a new window. Nothing falls into it, it loads the calendar, 3 empty text fields, 3 labels, 2 buttons and an empty Crystal Report Viewer.

When the user starts in the calendar, he automatically inserts the first and last dates of the selected month in 2 text fields. One button loads the CR report with data from the database, another button prints the report.

This works fine on my system, but the Initialize component throws a null reference exception when deploying peers to the system. I cannot recreate an exception in my system.

Does anyone have any ideas on where I should start?

Update

ERROR

System.NullReferenceException: Object reference not set to an instance of an object. at System.Windows.Baml2006.Baml2006Reader.Process_PropertyWithConverter() at System.Windows.Baml2006.Baml2006Reader.Process_OneBamlRecord() at System.Windows.Baml2006.Baml2006Reader.Process_BamlRecords() at System.Windows.Baml2006.Baml2006Reader.Read() at System.Windows.Markup.WpfXamlLoader.TransformNodes(XamlReader xamlReader, XamlObjectWriter xamlWriter, Boolean onlyLoadOneNode, Boolean skipJournaledProperties, Boolean shouldPassLineNumberInfo, IXamlLineInfo xamlLineInfo, IXamlLineInfoConsumer xamlLineInfoConsumer, XamlContextStack`1 stack, IStyleConnector styleConnector) at System.Windows.Markup.WpfXamlLoader.Load(XamlReader xamlReader, IXamlObjectWriterFactory writerFactory, Boolean skipJournaledProperties, Object rootObject, XamlObjectWriterSettings settings, Uri baseUri) at System.Windows.Markup.WpfXamlLoader.LoadBaml(XamlReader xamlReader, Boolean skipJournaledProperties, Object rootObject, XamlAccessLevel accessLevel, Uri baseUri) at System.Windows.Markup.XamlReader.LoadBaml(Stream stream, ParserContext parserContext, Object parent, Boolean closeStream) at System.Windows.Application.LoadComponent(Object component, Uri resourceLocator) at KeyInScreen.RebatesReports.InitializeComponent() at KeyInScreen.RebatesReports..ctor() at KeyInScreen.Menu.FertiliserRebate_Click(Object sender, RoutedEventArgs e) 

XAML Code

 <Window x:Class="KeyInScreen.RebatesReports" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="Fertiliser Rebates" WindowState="Maximized" xmlns:my="clr-namespace:SAPBusinessObjects.WPF.Viewer;assembly=SAPBusinessObjects.WPF.Viewer" mc:Ignorable="d" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" Height="700" Width="1350"> <Window.Resources> <Style TargetType="{x:Type Label}"> <Setter Property="FontSize" Value="14" /> </Style> <Style TargetType="{x:Type Button}"> <Setter Property="FontSize" Value="14"/> </Style> <Style TargetType="{x:Type Calendar}"> <Setter Property="FontSize" Value="14"/> </Style> <Style TargetType="{x:Type TextBox}"> <Setter Property="FontSize" Value="14"/> </Style> </Window.Resources> <Grid Background="#FFEFEDDF"> <Grid.RowDefinitions> <RowDefinition Height=".5*"/> <RowDefinition Height=".5*"/> <RowDefinition Height="4*"/> <RowDefinition Height="*"/> <RowDefinition Height="*"/> <RowDefinition Height="*"/> <RowDefinition Height="*"/> <RowDefinition Height="*"/> <RowDefinition Height="*"/> <RowDefinition Height="5*"/> </Grid.RowDefinitions> <Grid.ColumnDefinitions> <ColumnDefinition Width=".2*"/> <ColumnDefinition Width=".7*"/> <ColumnDefinition Width=".7*"/> <ColumnDefinition Width=".7*"/> <ColumnDefinition Width=".5*"/> <ColumnDefinition Width="4*"/> <ColumnDefinition Width=".1*"/> </Grid.ColumnDefinitions> <Calendar x:Name="cDatePicker" Grid.Column="1" Grid.Row="2" Grid.RowSpan="2" Grid.ColumnSpan="2" SelectedDatesChanged="cDatePicker_SelectedDatesChanged" /> <Label Content="Start Date:" Grid.Column="1" Grid.Row="4" Margin="5"/> <TextBox x:Name="txtStartDate" Grid.Column="2" Grid.Row="4" Margin="5" VerticalContentAlignment="Center" /> <Label Content="End Date:" Grid.Column="1" Grid.Row="5" Margin="5"/> <TextBox x:Name="txtEndDate" Grid.Column="2" Grid.Row="5" Margin="5" VerticalContentAlignment="Center"/> <Label Content="Supplier Number:" Grid.Column="1" Grid.Row="6" Margin="5"/> <TextBox x:Name="txtCustomerNumber" Grid.Column="2" Grid.Row="6" Margin="5" VerticalContentAlignment="Center" TabIndex="1" /> <Button x:Name="btnShowRport" Content="View Report" Grid.Column="1" Grid.Row="8" Margin="0,0,10,0" Click="btnShowRport_Click" IsDefault="True" /> <Button x:Name="btnPrintReport" Content=" Print Report" Grid.Column="2" Grid.Row="8" Margin="10,0,0,0" Click="btnPrintReport_Click" /> <my:CrystalReportsViewer x:Name="crReportViewer" Grid.Column="3" Grid.RowSpan="10" HorizontalAlignment="Center" VerticalAlignment="Center" Height="656" Width="845" Margin="94,-7,62,12" ToggleSidePanel="None" Panel.ZIndex="0" Grid.ColumnSpan="3" ShowPrintButton="False" ShowRefreshButton="False" ShowSearchTextButton="False" ShowToggleSidePanelButton="True" ShowToolbar="True" ShowNextPageButton="True" ShowGoToPageButton="True" ShowExportButton="False" ShowCopyButton="False" SnapsToDevicePixels="True" ShowLogo="False" ShowPrevPageButton="True" ShowStatusbar="True" /> </Grid> 

thanks

Answer 1

You need to look at the internal exception. When the source component is called, it may run other code that should throw an exception. An internal exception should provide you with all the necessary information. Note that it is possible that an internal exception will have an internal exception. Modify the application to write it all to a file or to the clipboard or something like that.

Answer 2

A little late, but when you get a null reference exception like this, it can be misleading. The internal exception may be null (it was in my case.)

As I discovered, the problem was to include exceptions with the first probability in VS 2010.

Go to Debug -> Exceptions then check all fields.

Answer 3

The problem disappeared when I renamed / deleted old assemblies at the GAC location (C: \ Windows \ Microsoft.NET \ assembly \ GAC_MSIL => GAC for .NET Framework 4.0 or higher).