After updating the bootstrap this error appears when I try to run a view why? The object reference has not been defined as an instance of an object.

Question

Answer 1

You're using server side bundling. That means you have a BundleConfig.cs or similar file in your code where the bundles are defined. If you look in that file then it'll have a bundle defined for Bootstrap. Often when using server side bundling the code references the JS files and those files are contained in a versioned-path. If you updated bootstrap then you need to ensure you also updated the bundle configuration to use the new path otherwise you'll get runtime errors.

Answer 2

Hi @GILBERTO GEOFRAGAS ,
I think,you need to check your bootstrap.js in BundleConfig.cs inside App_Start folder. Just like this:

            bundles.Add(new ScriptBundle("~/bundles/bootstrap").Include(  
                      "~/Scripts/bootstrap.js"));  

Best regards,
Yijing Sun

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Answer 3

Bootstrap v5 has no dependency on Jquery anymore so, I think including jquery and bootstrap.js in the same bundle object causes this issue. Check this URL: https://blog.webnersolutions.com/nuget-packages-update-scripts-bundle-error-caused-by-bootstrap-5-x-in-net-mvc-application/

Answer 4

If this issue is not resolved yet you can use the traditional way of approach, like in the image.