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HomeHomeGetting StartedGetting StartedInstalling DNN ...Installing DNN ...Collection cannot be null. Parameter name: c error while moving DotNetNuke site from one server to aCollection cannot be null. Parameter name: c error while moving DotNetNuke site from one server to a
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2/1/2013 5:35 AM
 
sidp


Joined: 2/1/2013
Posts: 1

I was trying to migrate a DNN website from one server to another by following this blog post.

After creating the new alias for the site, like theabc.co.uk, I have copy paste the source files from server A to server B under httpdocs and used Import and export tool to move my database to destination.

But while running the page, I get the following error. It seems to me that its related to portal but the alias in the portalalias table is already defined for '0' portal id.

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below. [ArgumentNullException: Collection cannot be null. Parameter name: c] System.Collections.ArrayList..ctor(ICollection c) +9364083 DotNetNuke.Entities.Portals.PortalController.GetPortals() +183 DotNetNuke.Common.Initialize.CacheMappedDirectory() +39 DotNetNuke.Common.Initialize.InitializeApp(HttpApplication app) +375 DotNetNuke.Common.Initialize.Init(HttpApplication app) +155 DotNetNuke.HttpModules.RequestFilter.RequestFilterModule.FilterRequest(Object sender, EventArgs e) +231 System.Web.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +148 System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +75
c# asp.net dotnetnuke dotnetnuke-5
 
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2/19/2013 5:42 AM
 
Michael Tobisch


Michael Tobisch's Avatar

https://www.dnnwerk.at
Joined: 6/27/2005
Posts: 2083
Same thing happened to me yesterday. The solution was: the user who runs the app pool was in the public role for the SQL Server database, and not in the db_owner role (I was pretty sure, I added the db_owner role, but this was obviously not the case!). After assigning db_owner, everything worked fine.

Best wishes
Michael

Michael Tobisch
DNN★MVP

dnn-Connect.org - The most vibrant community around the DNN-platform
 
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