Home page appears only partially

All the home page shows is the logo.

Here is the entirety of generated HTML.

<!DOCTYPE html>
<html id="ng-app" ng-app="piwikApp">
    <meta charset="utf-8">
    <meta name="robots" content="noindex,nofollow">
    <title>Piwik 3.0.1 &rsaquo; Installation</title>
    <link rel="stylesheet" type="text/css" href="index.php?module=Installation&action=getInstallationCss"/>
    <script type="text/javascript" src="index.php?module=Installation&action=getInstallationJs"></script>
    <link rel="shortcut icon" href="plugins/CoreHome/images/favicon.png"/>
<body ng-app="app" id="installation">

<div class="container">
    <div class="header">
        <div class="logo">
            <img title="Piwik 3.0.1 - free&#x2F;libre&#x20;analytics&#x20;platform" src="plugins/Morpheus/images/logo.png"/>
            <p>free/libre analytics platform</p>
        <div class="language-selector">

What’s crashing? If it’s a PHP error, why does it not display it?

The server log shows:

SoftException in Application.cpp:632: Directory “/home/elithi5/public_html/analytics” is writeable by group

I did try to delete all files in /tmp/. No change

The consultant who I hired to fix it said that the problem is that PHP did not have enough memory, and that it was really tough to find the problem, because the PHP error was logged in a log that was buried somewhere in the VPS (virtual Private Server).