I have an image gallery that's using uComponents' Multi Node Tree Picker and I want the thumbs to be crops instead of a CSS-induced version. I've used the same set-up (set the datatype up, added the cropper property to the Image media type) and syntax that I've used on other projects but the Umbraco version I'm working with is a different version (4.7.0) , so my image Url-fetching script is slightly different to usual and has created this problem.  Whenever my code is run I get the error message: 'string' does not contain a definition for 'Find'. 

Here's my current code, with 'gallery' being the Node Picker alias, and CaseStudyThumb being the Image Cropper alias:

@if (@Model.HasProperty("gallery") && @Model.GetProperty("gallery").Value != String.Empty)
    {
            @foreach (var x in @Model.gallery) 
                {
                    var item = @Model.MediaById(@x.InnerText);
                   
<a href="@item.umbracoFile">
<img src="@item.Crops.Find("@name", "CaseStudyThumb").url" alt="@item.Name" />
</a>
                }
    }

Thanks!