Unidentified error - Githubissues

I have a problem that I couldn't identify.
I'm using a router with vyos installed, and a user called "lg" configured to use the system, but even passing the login data on that router, the page always returns the same error.
Error print
Config file:
<?php

/*
 * Main configuration file example.
 *
 * DO NOT EDIT NOR RENAME, please copy to 'config.php' and edit the new file!
 */

// People to contact
// Set both to null to not display any contact information
$config['contact']['name'] = 'Example Support';
$config['contact']['mail'] = 'support@example.com';

// Frontpage configuration

// Title of the page
$config['frontpage']['title'] = 'Looking Glass';
// Logo to display (remove it to not display any logo)
$config['frontpage']['image'] = 'logo.png';
// Disclaimer to inform people using the looking glass
// Set it to null to not display a disclaimer
$config['frontpage']['disclaimer'] = 'This is a disclaimer!';

// Things to remove from the output (PHP compatible regex)
$config['filters']['output'][] = '/(client1|client2)/';
$config['filters']['output'][] = '/^NotToShow/';
// Matched patterns can also replaced inline
$config['filters']['output'][] = ['/replacethis/', 'withthis'];

// If telnet is used in combination with extreme_netiron, uncomment the following filter
//$config['filters']['output'][] = '/([^\x20-\x7E]|User|Please|Disable|telnet|^\s*$)/';

// Google reCaptcha integration
$config['recaptcha']['enabled'] = false;
$config['recaptcha']['apikey'] = 'foobar';
$config['recaptcha']['secret'] = 'foobar';

// Routers definitions

// Authentication based on SSH or Telnet with password
// The hostname or the IP address
$config['routers']['router1']['host'] = 'address_router';
// The user to use to connect to the router
$config['routers']['router1']['user'] = 'lg';
// The password of the given user
$config['routers']['router1']['pass'] = 'password';
// The authentication mechanism to use (can be ssh-password or telnet)
$config['routers']['router1']['auth'] = 'ssh-password';
// The router type (can be cisco, ios, juniper or junos)
$config['routers']['router1']['type'] = 'vyos';
// The router source interface to be used
$config['routers']['router1']['source-interface-id'] = 'eth0';
// The router description to be displayed in the router list
$config['routers']['router1']['desc'] = 'Vyos Router';

// Authentication based on SSH with key
// The hostname or the IP address
$config['routers']['router2']['host'] = 'r2.example.net';
// The user to use to connect to the router
$config['routers']['router2']['user'] = 'readonlyuser';
// The public key of the given user
$config['routers']['router2']['private_key'] = '/home/user/.ssh/key';
// The passphrase of the key (optional if the key has no passphrase)
$config['routers']['router2']['pass'] = 'mypassphrase';
// The authentication mechanism to use (ssh-key for SSH based on keys)
$config['routers']['router2']['auth'] = 'ssh-key';
// The router type (can be cisco, ios, juniper or junos)
$config['routers']['router2']['type'] = 'juniper';
// The router source interface to be used
$config['routers']['router2']['source-interface-id'] = 'lo0';
// The router description to be displayed in the router list
$config['routers']['router2']['desc'] = 'Example\'s Router 2';

// Router based on BIRD
// The hostname or the IP address
$config['routers']['router3']['host'] = 'r3.example.net';
// The user to use to connect to the router
$config['routers']['router3']['user'] = 'birduser';
// The password of the given user
$config['routers']['router3']['pass'] = 'birduserpassword';
// The authentication mechanism to use (can be ssh-password or ssh-key)
$config['routers']['router3']['auth'] = 'ssh-password';
// The router type (can only be bird)
$config['routers']['router3']['type'] = 'bird';
// The router source address to be used
$config['routers']['router3']['source-interface-id'] = '192.168.1.1';
// The router description to be displayed in the router list
$config['routers']['router3']['desc'] = 'Example\'s Router 3';

// Router based on OpenBGPd
// The hostname or the IP address
$config['routers']['router4']['host'] = 'r4.example.net';
// The user to use to connect to the router
$config['routers']['router4']['user'] = 'openbgpduser';
// The password of the given user
$config['routers']['router4']['pass'] = 'openbgpduserpassword';
// The authentication mechanism to use (can be ssh-password or ssh-key)
$config['routers']['router4']['auth'] = 'ssh-password';
// The router type (can only be openbgpd)
$config['routers']['router4']['type'] = 'openbgpd';
// The router source address to be used
$config['routers']['router4']['source-interface-id']['ipv4'] = '192.168.1.1';
$config['routers']['router4']['source-interface-id']['ipv6'] = '2001:db8::1';
// The router description to be displayed in the router list
$config['routers']['router4']['desc'] = 'OpenBGPd Router';

// Router based on Extreme NetIron
// The hostname or the IP address
$config['routers']['router5']['host'] = 'r5.example.net';
// The user to use to connect to the router
$config['routers']['router5']['user'] = 'readonlyuser';
// The password of the given user
$config['routers']['router5']['pass'] = 'readonlypassword';
// The authentication mechanism to use (must be telnet)
$config['routers']['router5']['auth'] = 'telnet';
// The router type (can only be extreme_netiron)
$config['routers']['router5']['type'] = 'extreme_netiron';
// The router source interface to be used
$config['routers']['router5']['source-interface-id']['ipv4'] = '192.168.1.1';
$config['routers']['router5']['source-interface-id']['ipv6'] = '2001:db8::1';
// The router description to be displayed in the router list
$config['routers']['router5']['desc'] = 'Example\'s router 5';
// Display BGP detail output for this router, defaults to false
$config['routers']['router5']['bgp_detail'] = true;

// If running on *BSD, disable '-A' which is non-existent
$config['tools']['ping_options'] = '-c 5';
// If running on *BSD, disable '-N' which is non-existent
$config['tools']['traceroute_options'] = '-A -q1 -w2 -m15';
// If running on *BSD, there is no '-4' or '-6'
$config['tools']['traceroute6'] = 'traceroute6';
$config['tools']['traceroute4'] = 'traceroute';

// Enables VRF subsystem
$config['vrfs']['enabled'] = true;
// The default IPv4 vrf
$config['vrfs']['vrfs'][] = 'inet.0';
// The default IPv6 vrf
$config['vrfs']['vrfs'][] = 'inet6.0';

// End of config.php
gmazoyer / looking-glass

Unidentified error #173
