Article ID: 114667, created on Aug 28, 2012, last review on Aug 25, 2016

  • Applies to:
  • Plesk 10.3 for Linux/Unix


We receive the following error message if we try to update a server's Parallels Plesk Panel license:

ERROR: PleskFatalException
Unknown key property: concerto

0: common_func.php3:93
psaerror(string 'Unknown key property: concerto')
1: common_func.php3:4831
getKeyProp(string 'concerto')
2: key_update.php:16

Cause & Resolution

The issue has been fixed in version 10.4, consider upgrading your installation.


The incorrect behavior is caused by this file:


Replace it with this fixed version using the correct procedure for hotfix installation:

How to install Panel hotfixes in Linux properly


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