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Issue error 500 Session_Exception login to Plesk

The locale which had been previously chosen as a default was unregistered from the Plesk database during a Plesk upgrade.
Try to fix it with the following steps:
  1. Set the locale en-US as default:
    Code:
    # plesk bin server_pref --set-default -locale en-US
    # plesk bin admin -u -locale en-US
  2. Reinstall Plesk updates:
    Code:
    # plesk installer update --repatch
  3. Log in to Plesk and set a required locale at Tools & Settings > Languages.
 
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