The PHP script cannot be run via Scheduled Tasks in Plesk: Could not open input file

Symptoms

• In an attempt to run the PHP script via Plesk > Domains > example.com > Scheduled Tasks > click Run now near the name of the task, the following error appears:

  PLESK_ERROR: Task "/usr/bin/php /var/www/vhosts/example.com/httpdocs/bin/magento cron:run" completed with error in 1 seconds, output:
  Could not open input file: /usr/bin/php /var/www/vhosts/example.com/httpdocs/bin/magento cron:run

• The field Script path in the task is set to /usr/bin/php /var/www/vhosts/example.com/httpdocs/bin/magento cron:run :
  

• The files /usr/bin/php and /var/www/vhosts/example.com/httpdocs/bin/magento exist on the server:

  # ls -al /usr/bin/php
  -rwxr-xr-x 1 root root 4618048 Nov 6 2016 /usr/bin/php
  
  # ls -la /var/www/vhosts/example.com/httpdocs/bin/magento
  -rw-r--r-- 1 user psacln 799 Sep 20 14:46 /var/www/vhosts/example.com/httpdocs/bin/magento

Cause

The syntaxis of the filled fields is incorrect.

Resolution

1. Log into Plesk.
2. Go to Domains > example.com > Scheduled Tasks.
3. Check that fields are filled correctly using this guide.

In the example above the following should be adjusted:

• Script path in the task should be set to httpdocs/bin/magento.
• with arguments field should be filled as cron:run.
• /usr/bin/php should not be presented in Script path field due to the fact that PHP is defined by the Use PHP version field: