How to solve this error?

How to solve the following error?

CS0234: The type or namespace name 'Helpers' does not exist in the namesp开发者_如何学运维ace 'NerdDinner' (are you missing an assembly reference?)

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If the error is occurring within a class:

Add using Nerddiners.Helpers; to the using statements in your class.

As a short cut, you can place your cursor on the relevant part of your code and press Ctrl + . and Visual Studio will add it for you.

If the error is occurring within a view:

Add the following to the top of your view (under the inherits definition)

<%@ Import Namespace="NerdDinner.Helpers" %>

or you can add it to the namespaces section of your projects web.config

<namespaces>
...
<add namespace="NerdDinner.Helpers" />

If the error is occurring within a test class you will need to add a project reference to your main NerdDinners project within the add references option of your test project.

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not much information given, but examplanation at msdn

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Right click on your project in visual studio and click "add reference". Then find the assembly that contains your helpers and add it in.

Failing that you have a programming error