I need help solving 'object reference not set to an instance of an object.'

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i keep geting an error i been following this guys vid on youtube he seems to not have the same problem

Build football scores app using C# and MVC5 - Chapter 1 - YouTube[^]

Imgur: The magic of the Internet[^]

Imgur: The magic of the Internet[^]

Razor

@model IEnumerable<Football_app_part_2.Models.Match>

@{
    Layout = null;
}

<!DOCTYPE html>

<html>
<head>
    <meta name="viewport" content="width=device-width" />
    <title>Index</title>
</head>
<body>
    <p>
        @Html.ActionLink("Create New", "Create")
    </p>
    <table class="table">
@foreach (var item in Model)
    {      <tr>
            <td>
                @Html.DisplayFor(modelItem => item.comp_id)
            </td>
            <td>
                @Html.DisplayFor(modelItem => item.formatted_date)
            </td>
            <td>
                @Html.DisplayFor(modelItem => item.season)
            </td>
            <td>
                @Html.DisplayFor(modelItem => item.week)
            </td>
            <td>
                @Html.DisplayFor(modelItem => item.venue)
            </td>
            <td>
                @Html.DisplayFor(modelItem => item.venue_id)
            </td>
            <td>
                @Html.DisplayFor(modelItem => item.venue_city)
            </td>
            <td>
                @Html.DisplayFor(modelItem => item.status)
            </td>
            <td>
                @Html.DisplayFor(modelItem => item.timer)
            </td>
            <td>
                @Html.DisplayFor(modelItem => item.time)
            </td>
            <td>
                @Html.DisplayFor(modelItem => item.localteam_id)
            </td>
            <td>
                @Html.DisplayFor(modelItem => item.localteam_name)
            </td>
            <td>
                @Html.DisplayFor(modelItem => item.localteam_score)
            </td>
            <td>
                @Html.DisplayFor(modelItem => item.visitorteam_id)
            </td>
            <td>
                @Html.DisplayFor(modelItem => item.visitorteam_name)
            </td>
            <td>
                @Html.DisplayFor(modelItem => item.visitorteam_score)
            </td>
            <td>
                @Html.DisplayFor(modelItem => item.ht_score)
            </td>
            <td>
                @Html.DisplayFor(modelItem => item.ft_score)
            </td>
            <td>
                @Html.ActionLink("Edit", "Edit", new { id=item.id }) |
                @Html.ActionLink("Details", "Details", new { id=item.id }) |
                @Html.ActionLink("Delete", "Delete", new { id=item.id })
            </td>
     </tr>
    }
    
    </table>
</body>
</html>

What I have tried:

i tryed using some techniques by dowloading some software but its hasnt work

Posted 8-Sep-20 0:36am

ashish nbhantama

Updated 8-Sep-20 0:49am

v5

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Comments

F-ES Sitecore 8-Sep-20 6:40am

What line throws the error? You need to find out what is null that you don't expect and we can't do that for you. The error is more likely to be in the controller.

ashish nbhantama 8-Sep-20 6:43am

what do you mean by find the null as i am new to coding i do not understand properly

F-ES Sitecore 8-Sep-20 7:43am

You are using a variable that is "null". From your screenshots it looks like Model is null and if it is null you can't loop through it. So you need to look at the controller which will have a line like

return View(model)

In that code "model" will be null, so you have to work out why it is null if you expect it to have a value.

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Sandeep Mewara · Answer 1 · 2020-09-08T00:41:00

Quote:
'object reference not set to an instance of an object.'

Details about the error you see: NullReferenceException Class (System) | Microsoft Docs[^]

Quote:
A NullReferenceException exception is thrown when you try to access a member on a type whose value is null

Possibly because:
1. You've forgotten to instantiate a reference type
2. You've forgotten to dimension an array before initializing it.
3. You get a null return value from a method, and then call a method on the returned type.
4. You're using an expression (for example, you're chaining a list of methods or properties together) to retrieve a value
5. You're enumerating the elements of an array that contains reference types, and your attempt to process one of the elements throws
6. Exception is thrown by a method that is passed null

Following will help you learn about debugging:
Tutorial: Debug Visual Basic code - Visual Studio | Microsoft Docs[^]
First look at the debugger - Visual Studio | Microsoft Docs[^]

You have not shared the line/file error is occuring here. When you debug, you will be able to get the exact line where the variable is NULL and error is being raised.

Try out.

OriginalGriff · Answer 2 · 2020-09-08T00:47:00

This is one of the most common problems we get asked, and it's also the one we are least equipped to answer, but you are most equipped to answer yourself.

Let me just explain what the error means: You have tried to use a variable, property, or a method return value but it contains null - which means that there is no instance of a class in the variable.
It's a bit like a pocket: you have a pocket in your shirt, which you use to hold a pen. If you reach into the pocket and find there isn't a pen there, you can't sign your name on a piece of paper - and you will get very funny looks if you try! The empty pocket is giving you a null value (no pen here!) so you can't do anything that you would normally do once you retrieved your pen. Why is it empty? That's the question - it may be that you forgot to pick up your pen when you left the house this morning, or possibly you left the pen in the pocket of yesterdays shirt when you took it off last night.

We can't tell, because we weren't there, and even more importantly, we can't even see your shirt, much less what is in the pocket!

Back to computers, and you have done the same thing, somehow - and we can't see your code, much less run it and find out what contains null when it shouldn't.
But you can - and Visual Studio will help you here. Run your program in the debugger and when it fails, VS will show you the line it found the problem on. You can then start looking at the various parts of it to see what value is null and start looking back through your code to find out why. So put a breakpoint at the beginning of the method containing the error line, and run your program from the start again. This time, VS will stop before the error, and let you examine what is going on by stepping through the code looking at your values.

But we can't do that - we don't have your code, we don't know how to use it if we did have it, we don't have your data. So try it - and see how much information you can find out!

I need help solving 'object reference not set to an instance of an object.'

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