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_scope(_include_footer)
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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 TemplateSlang.TplCall.Visit(ExecContext e) in /home/simon/Documents/siteface/siteface/sitefaceCore/TemplateSlang/TemplateSlangMain.cs:line 3441
