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Error after upgrading DotNetNuke from 5.6.3 to 6.0.0

Posted on 2011-09-13
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Last Modified: 2012-05-12
I have recently upgraded my DotNetNuke website from 5.6.3 to 6.0.0. After the update, I observe the following errors

- When I click into any second-level pages (i.e the ones in the drop-down menu) this message would appear: "An error has occurred. An error has occurred. "
- When I log in as host, and click any menu items under 'Admin' or 'Host', this message would appear:  
An error has occurred. DotNetNuke.Services.Exceptions.PageLoadException: 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.Skins.Controls.LeftMenu.CheckShowPath(Int32 tabId, RadPanelItem panelItemToCheck, String pageName) at DotNetNuke.UI.Skins.Controls.LeftMenu.BuildPanelbar(RadPanelItemCollection rootCollection) at DotNetNuke.UI.Skins.Controls.LeftMenu.OnLoad(EventArgs e) at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) --- End of inner exception stack trace ---

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Any help is appreciated.
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Question by:quziguang
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Expert Comment

by:David Johnson, CD, MVP
ID: 36535122
check for updates to your addon's one of them probably is not compatible
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Accepted Solution

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quziguang earned 0 total points
ID: 36539479
I have found my own solution to this problem.

Refer to ApochEAD’s advice on http://www.dotnetnuke.com/Resources/Forums/forumid/108/threadid/424770/scope/posts/threadpage/3.aspx
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Author Closing Comment

by:quziguang
ID: 36558815
Question closed because no satisfactory solutions were found; ended up finding my own solution. Thanks to ve3ofa for trying to help.
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