Error when trying to render the wizard

[Bob]

I have a wizard that is defined like this:

    <TelerikWizard @bind-Value="step" Height="100%" Width="100%">
        <WizardSteps>
            <WizardStep Label="Information" OnChange="OnWizardStepChange">
                <Content>
                </Content>
            </WizardStep>
            @if (showMapping)
            {
                <WizardStep Label="Column Mapping" OnChange="OnWizardStepChange">
                    <Content>
                    </Content>
                </WizardStep>
            }
            @if (showPreview)
            {
                <WizardStep Label="Preview" OnChange="OnWizardStepChange">
                    <Content>
                    </Content>
                </WizardStep>
            }
            <WizardStep Label="Validation" OnChange="OnWizardStepChange">
                <Content>
                </Content>
            </WizardStep>
        </WizardSteps>
        <WizardButtons>
            @{
                var index = context;
                int lastStep = 3;
                if (!showMapping) { lastStep -= 1; }
                if (!showPreview) { lastStep -= 1; }

                if (index > 0)
                {
                    <TelerikButton ButtonType="ButtonType.Button" OnClick="@(() => step -= 1)">Previous</TelerikButton>
                }

                if (index < lastStep)
                {
                    <TelerikButton ButtonType="ButtonType.Button" OnClick="@(() => step += 1)">Next</TelerikButton>
                }

                if (index == lastStep)
                {
                    <TelerikButton ButtonType="ButtonType.Button" OnClick="@CreateImport">Import</TelerikButton>
                }
            }
        </WizardButtons>
    </TelerikWizard>

When I try to load the page, the Wizard is giving me the following error:

[12:06:18 WRN] Unhandled exception rendering component: Value cannot be null. (Parameter 'format')
System.ArgumentNullException: Value cannot be null. (Parameter 'format')
   at System.String.FormatHelper(IFormatProvider provider, String format, ParamsArray args)
   at System.String.Format(String format, Object arg0, Object arg1)
   at Telerik.Blazor.Components.TelerikWizard.get_PagerMessage()
   at Telerik.Blazor.Components.TelerikWizard.BuildRenderTree(RenderTreeBuilder __builder)
   at Microsoft.AspNetCore.Components.Rendering.ComponentState.RenderIntoBatch(RenderBatchBuilder batchBuilder, RenderFragment renderFragment)
   at Microsoft.AspNetCore.Components.RenderTree.Renderer.RenderInExistingBatch(RenderQueueEntry renderQueueEntry)
   at Microsoft.AspNetCore.Components.RenderTree.Renderer.ProcessRenderQueue()

I cannot figure out what I am doing wrong?

 

[Bob]

I figured out the problem.

I am using localization and did not update my messages.resx with the newest file which is required when using the Wizard Control.

Thanks.

[Petr]

Hi bob,

u update messages.resx from https://github.com/telerik/blazor-ui/blob/master/common/localization/ClientLocalizationResx/Shared/Resources/TelerikMessages.resx ?

[Dimo]

@Petr - there are two places to get updated localization files. One is maintained by us and one is maintained by the community.

• The Resources folder of our demo site. The demo site is part of the UI for Blazor installation: /demos/TelerikBlazorDemos/Resources/
• https://github.com/telerik/blazor-ui-messages

[Thomas]

Hello, can you explain more about how to resolve this issue?

I have the same problem but I don't know about how to resolve it

Thanks 

[Dimo]

@Thomas - 

1. Go to https://www.telerik.com/account/downloads
2. Go to UI for Blazor and download the full MSI or ZIP installer.
3. Run the MSI installer or extract the ZIP contents.
4. Update your app localization files with the help of TelerikMessages.resx and TelerikMessages.designer.cs from [installation folder]/demos/TelerikBlazorDemos/Resources/

[Thomas]

Hi @Dimo, thanks a lot for your help. I will try to do that