Unable to cast object of type MicrosoftAspNetCoreMvcJsonResult to type MicrosoftAspNetCoreMvcContentResult

The error message indicates that a casting operation is being attempted between two incompatible types in an ASP.NET Core application.

In this case, you are trying to cast an object of type Microsoft.AspNetCore.Mvc.JsonResult to type Microsoft.AspNetCore.Mvc.ContentResult.

This error typically occurs when you try to perform a cast between two different types that are not related or compatible with each other.

To fix this issue, you need to ensure that you are casting the object to the correct type. Check the code where the casting operation is being performed and make sure that you are using the appropriate type for the cast.

For example, if you are expecting a JSON result, you should use JsonResult instead of ContentResult:

JsonResult jsonResult = (JsonResult)result;

If you are expecting a content result, you should use ContentResult instead of JsonResult:

ContentResult contentResult = (ContentResult)result;

Make sure to review the documentation and examples for the specific type you are using to understand how to handle the returned result correctly in your application