How to solve Client found response content type of 'text/html; charset=utf-8', but expected 'text/xml' error

When I call the services from exe file then I got the error,how can I solve this error plz help me...............

 

 

{"Client found response content type of 'text/html; charset=utf-8', but expected 'text/xml'.\r\nThe request failed with the error message:\r\n--\r\n<?xml version=\"1.0\" ?>\r\n<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.1//EN\" \"/r/nhttp://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd\">\r\n<html xmlns=\"http://www.w3.org/1999/xhtml\" >\r\n<head>\r\n   <title>Server Unavailable\r\n</title>\r\n   </head>\r\n   <body>\r\n      <h1><span style=\"font-family:Verdana;color: #ff3300\">Server Application Unavailable\r\n</span></h1>\r\n  &nbs ...