"unexpected error occured"

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While working on adding content to a "Chief Corner page" attempting to add rss feed or blog feed to page. Went to visit home page to view code and site provided this message
"Unexpected Error Occured" below that was "File does not exist" now my index page is down and code reflect

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html lang="en" xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8" />
    <link rel="stylesheet" type="text/css" href="/concrete/themes/concrete/main.css" />
    <style type="text/css" data-area-style-area-handle="Main" data-block-style-block-id="248" data-style-set="47">.ccm-custom-style-container.ccm-custom-style-main-248{background-color:rgb(39, 0, 240)}</style><style type="text/css" data-area-style-area-handle="Main48" data-block-style-block-id="661" data-style-set="45">.ccm-custom-style-container.ccm-custom-style-main48-661{border-style:none}</style><style type="text/css" data-area-style-area-handle="Logo" data-style-set="42">.ccm-custom-style-logo{color:rgb(249, 7, 7);text-align:left}</style><style type="text/css" data-area-style-area-handle="Main" data-block-style-block-id="202" data-style-set="44">.ccm-custom-style-container.ccm-custom-style-main-202{border-style:none}</style><style type="text/css" data-area-style-area-handle="Main" data-block-style-block-id="253" data-style-set="43">.ccm-custom-style-container.ccm-custom-style-main-253{border-style:none}</style>
<link href="http://sheridanfd.org/index.php/rss/pio" rel="alternate" type="application/rss+xml">
<link href="/updates/concrete5.7.5.8_remote_updater/concrete/css/font-awesome.css" rel="stylesheet" type="text/css" media="all">
<script type="text/javascript" src="/updates/concrete5.7.5.8_remote_updater/concrete/js/jquery.js"></script>
<link href="/updates/concrete5.7.5.8_remote_updater/concrete/blocks/social_links/view.css" rel="stylesheet" type="text/css" media="all">
<link href="/packages/fundamental/blocks/fundamental_call_to_action/view.css" rel="stylesheet" type="text/css" media="all">
<link href="/packages/fundamental/blocks/fundamental_section/view.css" rel="stylesheet" type="text/css" media="all">
<link href="/updates/concrete5.7.5.8_remote_updater/concrete/css/app.css" rel="stylesheet" type="text/css" media="all">
<link href="/updates/concrete5.7.5.8_remote_updater/concrete/css/jquery-ui.css" rel="stylesheet" type="text/css" media="all">
</head>


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