Operations that change non-concurrent collections must have exclusive access. A concurrent update was performed on this collection and corrupted its state. The collection's state is no longer correct.
@template(_include_header)
##########################

   at System.Collections.Generic.Dictionary`2.FindValue(TKey key)
   at siteface.Core.Template.Execute(String html) in /home/simon/Documents/siteface/siteface/sitefaceCore/Core/Template.cs:line 631
   at siteface.Core.Template.Execute() in /home/simon/Documents/siteface/siteface/sitefaceCore/Core/Template.cs:line 604
   at siteface.module.CMSModule.<>c__DisplayClass2_0.<RegisterCallbacks>b__3(String[] str) in /home/simon/Documents/siteface/siteface/moduleCMS/Modules/CMSModule.cs:line 81
   at TemplateSlang.TplCall.Visit(ExecContext e) in /home/simon/Documents/siteface/siteface/sitefaceCore/TemplateSlang/TemplateSlangMain.cs:line 3441

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          Operations that change non-concurrent collections must have exclusive access. A concurrent update was performed on this collection and corrupted its state. The collection's state is no longer correct.
          
          @template(_include_footer)
          ##########################
          
             at System.Collections.Generic.Dictionary`2.FindValue(TKey key)
             at siteface.Core.Template.Execute(String html) in /home/simon/Documents/siteface/siteface/sitefaceCore/Core/Template.cs:line 631
             at siteface.Core.Template.Execute() in /home/simon/Documents/siteface/siteface/sitefaceCore/Core/Template.cs:line 604
             at siteface.module.CMSModule.<>c__DisplayClass2_0.<RegisterCallbacks>b__3(String[] str) in /home/simon/Documents/siteface/siteface/moduleCMS/Modules/CMSModule.cs:line 81
             at TemplateSlang.TplCall.Visit(ExecContext e) in /home/simon/Documents/siteface/siteface/sitefaceCore/TemplateSlang/TemplateSlangMain.cs:line 3441