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Why do I receive the Unmapped Exception Null error when I change the button items on the phone configuration page?

April 26, 2017button configuration Error exception items null phone unmapped

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Why do I receive the Unmapped Exception Null error when I change the button items on the phone configuration page?

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A. If you use the Microsoft Internet Explorer 8 browser, you receive this error. IE 8 is not a supported browser. The only supported browsers are Microsoft Internet Explorer version 6.x or version 7.x and Netscape Navigator version 7.1 or later.