At the top of your view file, you have something like:

@model MyViewModel

<div class="border">
    <h2>@Model.PageName</h2>
    <p>@Model.TeaserText</p>
    <p>
          ...
    </p>
</div>

Do you pass in a model that matches the @model directive?

hi, yes, i pass the correct model, and when i debug the view i even get the data correctly, but then i have an error that the view expecting other model

but if i write in the view "@layout = null", then i see the view and everything is ok - but i dont have the layout, which i need

Generally, the layout page is based on a model e.g. in Alloy layout is based on @model IPageViewModel<SitePageData> and this model has many properties depending on Page Data. Not sure using the same layout page could be the best approach.

Creating anew layout page for your views (views for those pages, not EPi Pages) could be an idea where you could define some strategy to select correct layout page or defining a layout in your view could also work. e.g.

rather 

@layout = null

use something like

@{
    Layout = "~/Views/Shared/NoIContent.cshtml";
}

If you want to show both Episerver and non episerver content, it might be better to create two layout pages.

In _viewstart.chstml you can have something like this:

@{
    Layout = ViewContext.ViewBag.LayoutPage;
}

And then in PageContextActionFilter.OnResultExecuting you can set the layout like this:

var viewModel = filterContext.Controller.ViewData.Model;

// epi
if (viewModel is IPageViewModel<...>)
{
    filterContext.Controller.ViewBag.LayoutPage = "~/Somepath/Layout.cshtml";
}
else
{
...
}

thank you, its solved my peoblem