Commented Unassigned: ScriptResource.axd Failing on _setActiveTabIndex [27637]

I am experiencing 2 errors. The first is while debugging in VS2012 asp.net 4.5 x64 I receive the following error 

JavaScript critical error at line 1, column 1 in http://localhost:8099/ScriptResource.axd?d=tpt4X7AdGiF06Z8lMRbdxY3O_pWFNcuT3Y6bh41HzJMsTDkr8jdWCUdr4B_l7Cflr0B6gwB7LVlBy1GlR2iBnIKc--LQOyrDetMAh2Aji66mEj_ixKWVNKK9zrxfEaynymZDzcgZUEQ1of5w4cdFdla6AeCllIIRvNwaS9ayxIQ1&t=b2ad012

SCRIPT1014: Invalid character

Once I click on continue I receive the following.... caused by the last line in the code below.

Unhandled exception at line 172, column 21 in http://localhost:8099 /ScriptResource.axd?d=287OQWnQVrIpiNOVvBD6FaVwN01EUI87APWCp33nfKuuJzxog48FJjl_d-7DalM3_xXeUO7jETj-JRFwrkF4VnYyjgbMSM-cmpPJeoy8QYQY6Kr7VvBNXXnBBH0ACJeUh00FiMiVDOa2GDMGvJZsBQ2&t=ffffffffda74082d

0x800a138f - JavaScript runtime error: Unable to get property '_set_active' of undefined or null reference

ActiveTabIndex: function (value) {

var self = this, opt = self.options;

if (value < -1) {
__ throw "invalid tab index";__
}

if (value >= self._tabs.length) {
value = self._tabs.length - 1;
}

if (!self._created || value != opt.activeTabIndex) {

if (opt.activeTabIndex != -1) {
__self._tabs[opt.activeTabIndex]._set_active(false);__


Comments: This happens for me when i add tabcontrol and hide all tabpanels (Visible = false).