Hybridauth configuration error.

Original error message: 'debug_mode' is set to 'true', but the given log file path 'debug_file' is not a writable file.

Trace

#0 /var/www/www.labancachevorrei.webank.it/htdocs/hybridauth/Hybrid/Auth.php(111): Hybrid_Logger->__construct()
#1 /var/www/www.labancachevorrei.webank.it/htdocs/hybridauth/Hybrid/Auth.php(55): Hybrid_Auth::initialize('/var/www/www.la...')
#2 /var/www/www.labancachevorrei.webank.it/htdocs/wp-content/themes/bootstrap-basic/login-with.php(64): Hybrid_Auth->__construct('/var/www/www.la...')
#3 /var/www/www.labancachevorrei.webank.it/htdocs/wp-includes/template-loader.php(74): include('/var/www/www.la...')
#4 /var/www/www.labancachevorrei.webank.it/htdocs/wp-blog-header.php(19): require_once('/var/www/www.la...')
#5 /var/www/www.labancachevorrei.webank.it/htdocs/index.php(17): require('/var/www/www.la...')
#6 {main}