Umbraco v 8.14

I got this error:

System.InvalidOperationException: The partial view 'Nested Content/ncHeroSlider' was not found or no view engine supports the searched locations. The following locations were searched: ~/Views/RenderMvc/Nested Content/ncHeroSlider.aspx ~/Views/RenderMvc/Nested Content/ncHeroSlider.ascx ~/Views/Shared/Nested Content/ncHeroSlider.aspx ~/Views/Shared/Nested Content/ncHeroSlider.ascx ~/Views/RenderMvc/Nested Content/ncHeroSlider.cshtml ~/Views/RenderMvc/Nested Content/ncHeroSlider.vbhtml ~/Views/Shared/Nested Content/ncHeroSlider.cshtml ~/Views/Shared/Nested Content/ncHeroSlider.vbhtml ~/Views/Partials/Nested Content/ncHeroSlider.cshtml ~/Views/MacroPartials/Nested Content/ncHeroSlider.cshtml ~/Views/Nested Content/ncHeroSlider.cshtml

But this file does exist:

~/Views/Partials/Nested Content/ncHeroSlider.cshtml

Here's my page view code:

@inherits Umbraco.Web.Mvc.UmbracoViewPage
@{
    Layout = "BasePage.cshtml";
}

<!-- hero -->
@if (Model.HasValue("HeroSlider")) {     
    var item = Model.Value<IEnumerable<IPublishedElement>>("HeroSlider");
    @Html.Partial($"Nested Content/ncHeroSlider", item.FirstOrDefault())
 }

Here's my nested content view code:

@using myProjectName.ModelsLibrary;
@inherits Umbraco.Web.Mvc.UmbracoViewPage<IPublishedElement>
@{
    Layout = null;

    var slides = Model.Value("slides") == null ? null : Model.Value<IEnumerable<NcHeroSliderItem>>("slides");
}

<div class="hero-slider">
    @foreach(NcHeroSliderItem slide in slides) {
        var image = slide.Value("Image") == null ? null : slide.Value<MediaWithCrops>("Image").MediaItem.GetCropUrl(1600,900);
        <div style="background:url(@image) no-repeat center center;">
            @if(slide.HasValue("Content"))
            {
                var item = Model.Value<IEnumerable<IPublishedElement>>("Content");
                @Html.Partial($"Nested Content/ncCopyBlock", item.FirstOrDefault(), new ViewDataDictionary { { "isHeader", true } })    
            }
        </div>
    }
</div>

I've used this setup before, so I'm not sure what I'm missing.