Blazor and passing @ref to component

i have a issue with component, when i assign @ref="longList Component" in an error appear, otherwise without @ref all work fine. I get an error but in this case i do not know what does mean. Help 😕 I lost last night and half of sunday 😕I am a beginner, so maybe i forgot about something.

<LogList @ref="logListComponent"/>    <!-- error --><LogList />    <!-- ok -->

    protected override async Task OnInitializedAsync()    {        logListComponent = new LogList();    }

Severity    Code    Description Project File    Line    Suppression StateError (active)  CS0426  The type name 'Client' does not exist in the type 'MqttClient'  MqttClient.Client   C:\Users\Konrad\Desktop\MQ\MqttClient\MqttClient\Client\obj\Debug\net7.0\Microsoft.CodeAnalysis.Razor.Compiler\Microsoft.NET.Sdk.Razor.SourceGenerators.RazorSourceGenerator\Pages_MqttClient_razor.g.cs    131