New Blazor Wasm project .net8 throws Could not find 'Helpers.setDotNetHelper'

[aschilr]

I created a new .net8 Blazor Wasm project and inserted only Blazor Barcode Scanner as described.
Inserted the component in the Home.razor and got the following error:

crit: Microsoft.AspNetCore.Components.WebAssembly.Rendering.WebAssemblyRenderer[100]
Unhandled exception rendering component: Could not find 'Helpers.setDotNetHelper' ('Helpers' was undefined).
Error: Could not find 'Helpers.setDotNetHelper' ('Helpers' was undefined).
at https://localhost:7083/_framework/blazor.web.js:1:734
at Array.forEach ()
at l.findFunction (https://localhost:7083/_framework/blazor.web.js:1:702)
at b (https://localhost:7083/_framework/blazor.web.js:1:5445)
at https://localhost:7083/_framework/blazor.web.js:1:3238
at new Promise ()
at y.beginInvokeJSFromDotNet (https://localhost:7083/_framework/blazor.web.js:1:3201)
at Object.ri [as invokeJSJson] (https://localhost:7083/_framework/blazor.web.js:1:165152)
at https://localhost:7083/_framework/dotnet.runtime.8.0.3.lxiirgj8ch.js:3:178111
at xl (https://localhost:7083/_framework/dotnet.runtime.8.0.3.lxiirgj8ch.js:3:178945)

[AmenallahBarkaoui]

I think you just need to add the following lines to wwwroot\index.html (for server side _Host.cshtml) before the closing body tag as mentioned in the doc:
<script src="_content/BlazorBarcodeScanner.ZXing.JS/zxingjs.index.min.js"></script>
<script src="_content/BlazorBarcodeScanner.ZXing.JS/BlazorBarcodeScanner.js"></script>

[michielvh2002]

I have the same problem and I added those lines.
I will come back if I find the cause.

Update: you also have to install the package in the server and add the script tags to your _Host.cshtml file, not your index.html in the client. This is poorly explained in the docs. (Yes this is for WASM, not server side or combined)