I have this error when I try to upgrade to version 1.4.6 with the command perl imscp-autoinstall -d
[ERROR] iMSCP::Stepper::_callback: Couldn't connect to SQL server: DBI connect('database=','',...) failed: Access denied for user 'root'@'localhost' (using password: NO) at /usr/local/src/imscp-1.4.6/engine/PerlLib/iMSCP/Database/mysql.pm line 95.
[ERROR] autoinstaller::Functions::install: An error occurred while performing installation steps
The server has
Version I-MSCP 1.3.16 to Upgrade 1.4.6
debian version is 8.8
PHP 7.1.6-2+0~20170614060700.1+jessie~1.gbp831871 (cli) (built: Jun 14 2017 06:28:54) ( NTS )
Copyright (c) 1997-2017 The PHP Group
Zend Engine v3.1.0, Copyright (c) 1998-2017 Zend Technologies
with Zend OPcache v7.1.6-2+0~20170614060700.1+jessie~1.gbp831871, Copyright (c) 1999-2017, by Zend Technologies
How can I fix the problem?