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Forums Using DNN Platform Administration and Configuration

Object reference not set to an instance of an object.

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Tom Wolfe
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Posts: 10
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2/3/2021 6:44 PM

We have a website that seems to be working fine,  but it keeps throwing this error message over and over:

 

AbsoluteURL:/Default.aspx

DefaultDataProvider:DotNetNuke.Data.SqlDataProvider, DotNetNuke

ExceptionGUID:7d42defc-a15b-4cb4-b69d-350b4fe808cb

AssemblyVersion:

PortalId:-1

UserId:-1

TabId:-1

RawUrl:

Referrer:

UserAgent:

ExceptionHash:9gFTpZMnF4ZFqFjOEPLN0pPwDTo=

Message:Object reference not set to an instance of an object.

StackTrace:

at DotNetNuke.UI.Skins.Skin.InjectModule(Pane pane, ModuleInfo module)

 

InnerMessage:

InnerStackTrace:


 

 

Source:DotNetNuke

FileName:

FileLineNumber:0

FileColumnNumber:0

Method:

Joe Craig
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2/3/2021 7:55 PM
First, the basic questions: Which version of DNN are you using? Have you recently upgraded or added modules? Can you tell if this is new behavior or not?

The only thing that the error message is telling you is that there is a problem injecting a module into the page, and that something is not initialized.

Are you actually able to see pages? Are there any modules missing?

Take a look at the log files in /portals/_default/logs. Look at the most recent one.

If that doesn't provide more helpful information (and it might not!) modify DotNetNuke.log4net.config in the root of your installation and configure it for more detailed logging, though that's not guaranteed to help either.
Timo Breumelhof.
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2/10/2021 10:05 AM

Mostly this is a Skin / Theme issue, did you try using the default theme to see if that has this issue too?

markvanber
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Posts: 1
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2/8/2022 12:54 AM

An Object is an instance of a Class , it is stored some where in memory. A reference is what is used to describe the pointer to the memory location where the Object resides. The message "object reference not set to an instance of an object" means that you are referring to an object the does not exist or was deleted or cleaned up. It's usually better to avoid a NullReferenceException than to handle it after it occurs. To prevent the error, objects that could be null should be tested  before being used.

if (mClass != null)
{
  // Go ahead and use mClass
  mClass.property = ...
}
else
{
  // Attempting to use mClass here will result in NullReferenceException
}


 

Will Strohl
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2/15/2022 2:36 PM
You already have nearly all of the best troubleshooting advice. The only additional thing I'd add is that this is usually caused by another underlying and often suppressed exception. Be sure to check the Log4Net log files as Joe suggested and maybe even the Windows Event Log, if you're not finding anything.

In general, you should be checking your log files from time to time and getting rid of all exceptions you can find. The list of reasons you should do this is long. :)

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