Error Message

June 10, 2026 05:28 AM

1 min read

System.InvalidOperationException: The client found the response content type of ‘text/html; charset=utf-8', but expected ‘text/xml’.

The request failed with the following error message:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN” “http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head>

<title>IIS 8.0 Detailed Error - 500.19 - Internal Server Error</title>

…

 <fieldset><legend>Error Summary</legend>

 <h2>HTTP Error 500.19 - Internal Server Error</h2>

 <h3>The requested page cannot be accessed because the related configuration data for the page is invalid.</h3>

…