Installation problem on Synology "username already exits)

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Hi guys,

I am trying last few days install owncloud-package on Synology but I face a curious problem on finishing installation on 1st login

failure_login.jpg518×880 34.9 KB
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After installation the package (Owncloud 8.1) while log in (1st time) I get response “Fail username already exits” (in Dutch “Fout de gebruikersnaam bestaat al”

I’ve taken the following steps:

  1. Installation MariaDB (MySQL)
  2. Installation Package Owncloud version 8.1.1-7
  3. Check package-center: Owncloud is working
  4. In webservice, add hostname “owncloud” httpserver Apach 2.2, PHP 5.6
  5. Set permissions for HTTP-user (group) on owncloud directory: read/write
  6. Starting Owncloud with URL http://[nas]/owncloud/index.php
  7. Failure login “admin”, username already exists

Can anybody tell me what is going wrong?