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HomeHomeUsing DNN Platf...Using DNN Platf...Using Modules a...Using Modules a...Module Load Exception Error in custom ModuleModule Load Exception Error in custom Module
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7/8/2014 3:49 PM
 
Tom


Joined: 9/23/2011
Posts: 458

Hi,

 I'm currently seeing a new error in a custom module (a menu module developed by my co-worker). Fortunately, this is occurring on a test server version of our website. The module is still working fine on the live site. (Live site is running 7.1.2, and test server is running 7.2.1). I don't know what happened/changed to cause the error to begin occurring. (It worked fine through the last upgrade, and the problem began at some point more recently.)

 What's interesting about the error, is that it only occurs in instances where the module  is invoked through the skin file. When the module is placed on a page through Add New Module, it works. But when it's coded in the skin, (as I have done on many pages/skins) the error occurs consistently.

What I've also noticed is that if I add the module to a page where the error is occurring (since the module is already on the page as coded in the skin), it fixed the error for both instances. Then, both the skin-coded instance and the added module instance both seem to work OK.

 Any ideas why this might be occurring and what might have caused it to begin suddenly? (The person who created the module is unavailable at this time).

Here is the error itself:

DotNetNuke.Services.Exceptions.ModuleLoadException: Object reference not set to an instance of an object. ---> System.NullReferenceException: Object reference not set to an instance of an object. at DotNetNuke.UI.SaviNavigation.GetNavigationNodes(DNNNode objRootNode, ToolTipSource eToolTips, Int32 intStartTabId, Int32 intDepth, Int32 intNavNodeOptions, Boolean showInvisible) at DotNetNuke.UI.Skins.Controls.SaviMenu.GetNavigationNodes(DNNNode objNode) at DotNetNuke.UI.Skins.Controls.SaviMenu.BuildNodes(DNNNode objNode) at DotNetNuke.UI.Skins.Controls.SaviMenu.Page_Load(Object sender, EventArgs e) --- End of inner exception stack trace ---

 Thanks,

 Tom

 
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7/8/2014 7:04 PM
 
Kelly Ford


Kelly Ford's Avatar

Kelly Ford's Avatar

dnndev.com
Joined: 5/12/2003
Posts: 49
Hi Tom,

Since modules and skin objects have different lifecycles, my guess would be that the module is assuming some object is available. The object is available when loaded as a module but has not yet been instantiated when loaded via the skin. Stepping through the code should identify the culprit.

Best,
Kelly
Create simple forms or build complete module solutions XMod Pro is the best-selling forms and views module of all time.
 
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7/8/2014 7:50 PM
 
Tom


Joined: 9/23/2011
Posts: 458
Thank you Kelly. I will do a debug when my colleague who developed the module returns. Any ideas on why this would suddenly show the problem. Nothing much has changed on the site. The module worked fine after upgrading to 7.2.1, then some time later, started to fail.

Thanks again, I appreciate your input.

Tom
 
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7/9/2014 9:11 AM
 
Kelly Ford


Kelly Ford's Avatar

Kelly Ford's Avatar

dnndev.com
Joined: 5/12/2003
Posts: 49
Unfortunately, the object reference not set error doesn't provide enough data to debug from a distance like this. All I can say is that it is happening in the GetNavigationNodes() function. I can only speculate what might be in there. The fact that the error goes away when you put a module on a page would seem to point to an assumption being made about the environment the module is running in - expecting an object to be instantiated that isn't. It's impossible to know exactly what may be causing the issue without diving into the code, so I'm just throwing darts in the dark at this point :)

Best,
Kelly
Create simple forms or build complete module solutions XMod Pro is the best-selling forms and views module of all time.
 
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7/15/2014 7:30 PM
 
Tom


Joined: 9/23/2011
Posts: 458

Thanks for the info. I'm going to debug this when possible.

Tom
 
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