On Phone and Table device browsers, I get this error on two pages.
The two pages have one thing in common, a control being used. The one page basically is just a RadCaptcha giving access to another page.
They work fine with normal desktop browsers, or on the device when the browser is switched to desktop mode (Chrome).
The page has a just inside the form in the Site.Master file. It is an ASP.NET application Master files. The RadCaptcha is at the bottom the page well below the RadScriptManager definition.
If I add an aspiptManager, I get an error saying you can only have one script manager.
My RadScriptManager call looks like this.
The problem would seem to be RadCaptcha related.