Strange error when adding a new page in DotNetNuke

I have a DNN5.6.3-website.
 When I try to add a new page to my site I get this strange error:
 
Error: is currently unavailable.
 DotNetNuke.Services.Exceptions.ModuleLoadException: Sequence contains more than one element ---> System.InvalidOperationException: Sequence contains more than one element at System.Linq.Enumerable.SingleOrDefault[TSource](IEnumerable`1 source) at DotNetNuke.Entities.Modules.ModuleController.AddModulePermission(ModuleInfo& objModule, Int32 portalId, String roleName, PermissionInfo permission, String permissionKey) at DotNetNuke.Entities.Modules.ModuleController.LocalizeModuleInternal(ModuleInfo sourceModule) at DotNetNuke.Entities.Modules.ModuleController.LocalizeModule(ModuleInfo sourceModule, Locale locale) at DotNetNuke.Entities.Tabs.TabController.CreateLocalizedCopy(TabInfo originalTab, Locale locale) at DotNetNuke.Entities.Tabs.TabController.CreateLocalizedCopies(TabInfo originalTab) at DotNetNuke.Modules.Admin.Tabs.ManageTabs.SaveTabData(String strAction) at DotNetNuke.Modules.Admin.Tabs.ManageTabs.cmdUpdate_Click(Object Sender, EventArgs e) --- End of inner exception stack trace ---
 
Can somebody help me with this?
 
More information:
 - The site is bilingual, content localization is set on.
 - I only get this error when I add a new page with Culture Type: 'Create Localized Versions of Page'
 - After the error, the new pages are still added in both languages. But they are not localized.
 
Possible solution:
 - Googling my error suggests that the probleem has omething to do with multiple page-naming.
- I deleted the pages that I recently added. But there's no difference. It can't be in the pages that were allready in my website. The problem never occured before.
 
Any advice is appreciated!!
adiemeerAsked:
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BuggyCoderCommented:

Problem solved. After resetting the CultureCode column on the Tab table, there remained a duplicate key in collection problem which appeared to be connected with module localization. I checked the CultureCode column on the TabModules table and sure enough, it had been set to the culture of the default language for all modules. After setting it correctly (so that it corresponded to the CultureCode of the related Tab), the site appears to be fixed.

See this thread for reference:-
http://www.dotnetnuke.com/Resources/Forums/forumid/77/threadid/425157/scope/posts.aspx
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adiemeerAuthor Commented:
Hmm, this looks like something I want to trie. Unfortunately, I don't really know how to. Could you please help me with the steps mentioned? I guess this is SQL-Server-work? I'm not familiar with that...
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adiemeerAuthor Commented:
Anyone?
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adiemeerAuthor Commented:
Ehmm, BuggyCoder, or anyone else...

Please help!
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