CODEWITHSUNDEEP
asp.net-mvclessbundle
Razvan Dumitru
Razvan Dumitru

Reputation: 12452

These assets are not style sheets error in BundleTransformer

I encountered this annoying error telling me that .less files are not stylesheets. Oh Yea.

BundleTransformer.Core.Validators.InvalidAssetTypesException : These assets are not style sheets : 'Site/Content/Stylesheets/Less/style.less'

I have BundleTransformer.Less ( as package ).

My BundleConfig.cs : 

bundles.Add(new LessStyleBundle("~/SiteCSS").IncludeDirectory("~/Content/Stylesheets/Less", "*.less"));

My LessStyleBundle class : 

 public sealed class LessStyleBundle : StyleBundle
    {

        private static readonly IBundleTransform _cssTransformer = new StyleTransformer();
        private static readonly IBundleTransform _cssMinify = new CssMinify();

        public LessStyleBundle(string virtualPath)
            : base(virtualPath)
        {
            Orderer = new NullOrderer();
            Transforms.Add(_cssTransformer);
            Transforms.Add(_cssMinify);
        }
    }

And layout rendering : 

@Styles.Render("~/SiteCSS")

Anyone encounter same problem ? Thanks a lot for any advice.

Upvotes: 4

Views: 1067

Answers (2)

saurabh sahu
saurabh sahu

Reputation: 21

Install nuget package BundleTransformer.Less. It will resolve the issue.

check package.config

Upvotes: 2

Andrey Taritsyn
Andrey Taritsyn

Reputation: 1286

Check your the Web.config file. There should be the following settings:

<?xml version="1.0" encoding="utf-8"?>
<configuration>
    <bundleTransformer xmlns="http://tempuri.org/BundleTransformer.Configuration.xsd">
        <core ...>
            <css ...>
                ...
                <fileExtensions>
                    <add fileExtension=".css" assetTypeCode="Css" />
                    <add fileExtension=".less" assetTypeCode="Less" />
                    ...
                </fileExtensions>
                ...
            </css>
            ...
        </core>
    </bundleTransformer>
</configuration>

Also I do not recommend to write your own LessStyleBundle class. Better to use the BundleTransformer.Core.Bundles.CustomStyleBundle class and install the BundleTransformer.MicrosoftAjax module (after installation please read the readme.txt file).

Upvotes: 4

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