Installation problem error 500

Today I tried to install nextcloud 13 on my centos 7.3 server. I have also installed rh-php56 before installation and checked version and it is ok.
After filling up form with admin username and password and mysql username and password all accepted but after that I get error on page.
HTTP ERROR 500

And this is in log
{“reqId”:“WruaBaeKuZw7Ej@Si3OwdgAAAAo”,“level”:3,“time”:“2018-03-28T13:35:01+00:00”,“remoteAddr”:“111.111.111.111”,“user”:"–",“app”:“PHP”,“method”:“GET”,“url”:"/index.php",“message”:“Class ‘OCA\Files\App’ not found at /var/www/html/nextcloud/apps/files_sharing/appinfo/app.php#49”,“userAgent”:“Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.181 Safari/537.36”,“version”:“13.0.1.1”}
{“reqId”:“WruaBmAZdkl06NTV3OvZ9wAAAAg”,“level”:3,“time”:“2018-03-28T13:35:02+00:00”,“remoteAddr”:“111.111.111.111”,“user”:"–",“app”:“PHP”,“method”:“GET”,“url”:"/index.php",“message”:“Class ‘OCA\Files\App’ not found at /var/www/html/nextcloud/apps/files_sharing/appinfo/app.php#49”,“userAgent”:“Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.181 Safari/537.36”,“version”:“13.0.1.1”}
{“reqId”:“WruaGwWZj3RSYfcKqQ-91wAAAAA”,“level”:3,“time”:“2018-03-28T13:35:23+00:00”,“remoteAddr”:“111.111.111.111”,“user”:"–",“app”:“PHP”,“method”:“GET”,“url”:"/index.php",“message”:“Class ‘OCA\Files\App’ not found at /var/www/html/nextcloud/apps/files_sharing/appinfo/app.php#49”,“userAgent”:“Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.181 Safari/537.36”,“version”:“13.0.1.1”}
{“reqId”:“WruaGwiA-BQwxstAWieFKwAAAAI”,“level”:3,“time”:“2018-03-28T13:35:24+00:00”,“remoteAddr”:“111.111.111.111”,“user”:"–",“app”:“PHP”,“method”:“GET”,“url”:"/index.php",“message”:“Class ‘OCA\Files\App’ not found at /var/www/html/nextcloud/apps/files_sharing/appinfo/app.php#49”,“userAgent”:“Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.181 Safari/537.36”,“version”:“13.0.1.1”}

Did you disable SELINUX???

Yes I did, nothing worked so I deleted all and star installation all over again and now works ok