[InvalidOperationException: Collection was modified; enumeration operation may not execute.]
System.ThrowHelper.ThrowInvalidOperationException(ExceptionResource resource) +56
System.Collections.Generic.Enumerator.MoveNextRare() +12964134
System.Collections.Generic.Enumerator.MoveNext() +66
System.Linq.WhereListIterator`1.MoveNext() +138
System.Collections.Generic.List`1..ctor(IEnumerable`1 collection) +186
System.Linq.Enumerable.ToList(IEnumerable`1 source) +61
AjaxControlToolkit.ToolkitScriptManagerCombiner.GetExcludedScripts() +80
AjaxControlToolkit.ToolkitScriptManager.OnLoad(EventArgs e) +472
System.Web.UI.Control.LoadRecursive() +61
System.Web.UI.Control.LoadRecursive() +134
System.Web.UI.Control.LoadRecursive() +134
System.Web.UI.Control.LoadRecursive() +134
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +693
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