お世話になっております

(Ubuntu)
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=14.04
DISTRIB_CODENAME=trusty
DISTRIB_DESCRIPTION="Ubuntu 14.04.3 LTS"

(PHP)
PHP 5.5.30-1+deb.sury.org~precise+1 (cli) (built: Oct 4 2015 16:14:34)
Copyright (c) 1997-2015 The PHP Group
Zend Engine v2.5.0, Copyright (c) 1998-2015 Zend Technologies
with Zend OPcache v7.0.6-dev, Copyright (c) 1999-2015, by Zend Technologies

(nginx)
nginx version: nginx/1.4.6 (Ubuntu)

(mysql)
mysql Ver 14.14 Distrib 5.5.46, for debian-linux-gnu (x86_64) using readline 6.3

という状況で
/var/www/www.abc.com/

/var/www/www.cdf.com/

など使い分けています。

EC-CUBE2 はインストールして使っておりましたが
EC-CUBE3.0.7 をwww.abc.com としてインストールしようと
思ったら構造が全く変わっていて

nginxのerror.logは下記で　どう対処すればよいか
困っております。皆さんするっとインストールできているようなので・・・(´・ω・｀)

対応策を教えて頂けないでしょうか

http://magnets.jp/web_design/4625/
などを調べてみたのですがわからずでして。
よろしくお願い致します。

2015/12/24 23:56:22 [error] 7052#0: *1 FastCGI sent in stderr: "PHP message: PHP Notice: Undefined index: eccube_install in /var/www/www.abc.com/html/index.php on line 33" while reading response header from upstream, client: XXX.XXX.XXX.XXX, server: www.abc.com, request: "GET /html/ HTTP/1.1", upstream: "fastcgi://unix:/var/run/php5-fpm.sock:", host: "www.abc.com"
2015/12/24 23:56:22 [error] 7052#0: *1 rewrite or internal redirection cycle while internally redirecting to "/index.html", client: XXX.XXX.XXX.XXX, server: www.abc.com, request: "GET /html/install.php/step1 HTTP/1.1", host: "www.abc.com"
2015/12/24 23:56:22 [error] 7052#0: *2 rewrite or internal redirection cycle while internally redirecting to "/index.html", client: XXX.XXX.XXX.XXX, server: www.abc.com, request: "GET /favicon.ico HTTP/1.1", host: "www.abc.com", referrer: "http://www.abc.com/html/install.php/step1"
2015/12/24 23:56:23 [error] 7052#0: *6 FastCGI sent in stderr: "PHP message: PHP Notice: Undefined index: eccube_install in /var/www/www.abc.com/html/index.php on line 33" while reading response header from upstream, client: XXX.XXX.XXX.XXX, server: www.abc.com, request: "GET /html/ HTTP/1.1", upstream: "fastcgi://unix:/var/run/php5-fpm.sock:", host: "www.abc.com"
2015/12/24 23:56:23 [error] 7052#0: *6 rewrite or internal redirection cycle while internally redirecting to "/index.html", client: XXX.XXX.XXX.XXX, server: www.abc.com, request: "GET /html/install.php/step1 HTTP/1.1", host: "www.abc.com"
2015/12/24 23:56:23 [error] 7052#0: *5 rewrite or internal redirection cycle while internally redirecting to "/index.html", client: XXX.XXX.XXX.XXX, server: www.abc.com, request: "GET /favicon.ico HTTP/1.1", host: "www.abc.com", referrer: "http://www.abc.com/html/install.php/step1"