Installing nextcloud internal errors

The issue my are facing:
internal error
Like the picture below:


It probably means.:
An internal error occurred in the server and could not complete your request.
If this error occurs many times, please contact the server administrator. Please include the following technical details in your report.
More details can be found in the server logs.

Technical details are:
Remote address: 113.45.40.124
Request ID: vCzMIEUJHvZmDzRv9Wwp

This IP address
I’m not my server or client
Please, dear community partners, help me

my install server version:
nginx 1.12.2
php 5.6.8
mysql 5.6

php install module
Include official document requirements:

PHP module ctype
PHP module dom
PHP module GD
PHP module iconv
PHP module JSON
PHP module libxml
PHP module mbstring
PHP module posix
PHP module SimpleXML
PHP module XMLReader
PHP module XMLWriter
PHP module zip
PHP module zlib
PHP module curl
PHP module fileinfo
PHP module bz2
PHP module intl
PHP module mcrypt
PHP module openssl

the is my nextcloud php code config.php output info

<?php $CONFIG = array ( 'instanceid' => 'ocydjvvno8k2', 'passwordsalt' => 'i0cx3b7ebe1+DHTAE0y+8tTpdUFBHC', 'secret' => 'u+SMal3R8qccH972ARHBOECuQKYVam6fkW4mdnEjLd7WkSk0', 'trusted_domains' => array ( 0 => 'cloud.niknk.com', ), 'datadirectory' => '/data/web_db/nextcloud/data', 'overwrite.cli.url' => 'http://cloud.niknk.com', 'dbtype' => 'mysql', 'version' => '12.0.3.3', 'dbname' => 'nextcloud', 'dbhost' => 'localhost', 'dbport' => '', 'dbtableprefix' => 'oc_', 'mysql.utf8mb4' => true, 'dbuser' => 'admincloud', 'dbpassword' => '65a44ca332ba854', 'installed' => true, ); the is my nginx service access log output info 113.45.40.124 - - [31/Oct/2017:15:39:01 +0800] "GET /core/js/contactsmenu.js?v=7ab5f3fb12a68d1cc5ae3ccf7badfe28-0 HTTP/1.1" 200 12966 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:56.0) Gecko/20100101 Firefox/56.0" 113.45.40.124 - - [31/Oct/2017:15:39:01 +0800] "GET /core/l10n/zh_CN.js?v=7ab5f3fb12a68d1cc5ae3ccf7badfe28-0 HTTP/1.1" 200 34075 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:56.0) Gecko/20100101 Firefox/56.0" 113.45.40.124 - - [31/Oct/2017:15:39:01 +0800] "GET /index.php/js/core/merged-template-prepend.js?v=7ab5f3fb12a68d1cc5ae3ccf7badfe28-0 HTTP/1.1" 500 4505 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:56.0) Gecko/20100101 Firefox/56.0" 113.45.40.124 - - [31/Oct/2017:15:39:02 +0800] "GET /core/vendor/core.js?v=7ab5f3fb12a68d1cc5ae3ccf7badfe28-0 HTTP/1.1" 200 1037663 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:56.0) Gecko/20100101 Firefox/56.0" 113.45.40.124 - - [31/Oct/2017:15:39:03 +0800] "GET /index.php/js/core/merged-template-prepend.js?v=7ab5f3fb12a68d1cc5ae3ccf7badfe28-0 HTTP/1.1" 500 4505 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:56.0) Gecko/20100101 Firefox/56.0" 113.45.40.124 - - [31/Oct/2017:15:39:03 +0800] "GET /core/img/logo-icon.svg?v=1 HTTP/1.1" 200 1049 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:56.0) Gecko/20100101 Firefox/56.0" 113.45.40.124 - - [31/Oct/2017:15:39:03 +0800] "GET /core/fonts/OpenSans-Regular.woff HTTP/1.1" 200 20544 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:56.0) Gecko/20100101 Firefox/56.0" 113.45.40.124 - - [31/Oct/2017:15:39:03 +0800] "GET /core/img/background.jpg?v=1 HTTP/1.1" 200 95212 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:56.0) Gecko/20100101 Firefox/56.0" 113.45.40.124 - - [31/Oct/2017:15:39:03 +0800] "GET /core/fonts/OpenSans-Light.woff HTTP/1.1" 200 62844 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:56.0) Gecko/20100101 Firefox/56.0" 113.45.40.124 - - [31/Oct/2017:15:39:03 +0800] "GET /core/fonts/OpenSans-Semibold.woff HTTP/1.1" 200 69888 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:56.0) Gecko/20100101 Firefox/56.0"