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Created Unassigned: Error 0x800a138f - JavaScript runtime error: Unable to get property 'length' of undefined or null reference [27848]

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I have a page that was working fine with a tree control on the left and a calendar control on the right. I added a tab control, and I started getting this error. It does not matter where I ad the tab control or what the tab control has in it - it can just be a text label in each tab.
In my research I found that this problem, or something very similar, happened with previous version and the solution was to replace the Script Manager with the control toolkit's script manager. But with version 15.1, control toolkit did away with its own script manager in favor of the default asp script manager, which I use on my page. I am using IE 11, Visual Studio Ultimate 2013, .NET 4.5.
Help please!!!

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