To solve the problem with the website on opencart

Website:

https://bit.ly/38HjrFg

1.Problem:

2020-03-11 2:48:42 - PHP Warning: fopen(/var/www/www-root/data/www/ua.alleclick.com/download/test): failed to open stream: Permission denied in /var/www/www-root/data/www/......./neadmin/controller/common/home.php on line 99

2020-03-11 2:48:42 - PHP Warning: fwrite() expects parameter 1 to be resource, boolean given in /var/www/www-root/data/www/......./neadmin/controller/common/home.php on line 101

2020-03-11 2:48:42 - PHP Warning: fclose() expects parameter 1 to be resource, boolean given in /var/www/www-root/data/www/........../neadmin/controller/common/home.php on line 103

2020-03-11 2:48:42 - PHP Warning: sprintf(): Too few arguments in /var/www/www-root/data/www/........../neadmin/controller/common/home.php on line 106

In the transition of Sales Orders received :

The website is not yet able to process this request.

HTTP ERROR 500

2. Sending email when ordering

The website does not send email