Error updating extension Let's Encrypt version 2.0.3-31

[ckn19341]

On a Strato Virtuelserver Environment: (Plesk version 17.5.3 Update #4) on Linux (Ubuntu 14.04.5 LTS‬) with Let’s Encrypt extension.

Updating results in this error:

Execution of /opt/psa/admin/plib/modules/letsencrypt/scripts/post-install.php failed with exit code 1 and the output:
[2017-07-23 10:44:30] ERR [panel] parse error:
0: /opt/psa/admin/plib/Scheduler/Crontab/Entry.php:101
Scheduler_Crontab_Entry->_parseString(string 'REDIS0006?acrakcit<')
1: /opt/psa/admin/plib/Scheduler/Crontab/Entry.php:54
Scheduler_Crontab_Entry->__construct(string 'REDIS0006?acrakcit<')
2: /opt/psa/admin/plib/Scheduler/Crontab.php:137
Scheduler_Crontab->{closure}(string 'REDIS0006?acrakcit<')
3: :
array_map(object of type Closure, array)
4: /opt/psa/admin/plib/Scheduler/Crontab.php:139
Scheduler_Crontab->_import()
5: /opt/psa/admin/plib/Scheduler/Crontab.php:43
Scheduler_Crontab->initCrontab(string 'root')
6: /opt/psa/admin/plib/Scheduler/Crontab.php:53
Scheduler_Crontab->__construct(object of type Db_Table_Row_ServiceNode_ManagementNode, string 'root')
7: /opt/psa/admin/plib/Scheduler/Factory.php:24
Scheduler_Factory::get(object of type Db_Table_Row_ServiceNode_ManagementNode, string 'root')
8: /opt/psa/admin/plib/pm/Scheduler.php:100
pm_Scheduler->__construct()
9: /opt/psa/admin/plib/pm/Scheduler.php:113
pm_Scheduler::getInstance()
10: /opt/psa/admin/plib/modules/letsencrypt/library/Installer.php:294
PleskExt\Letsencrypt\Installer->scheduleRenewTask()
11: /opt/psa/admin/plib/modules/letsencrypt/library/Installer.php:70
PleskExt\Letsencrypt\Installer->handlePostInstall()
12: /opt/psa/admin/plib/modules/letsencrypt/scripts/post-install.php:13
parse error

[pfg]

As this is an issue that’s specific to Plesk’s Let’s Encrypt implementation, you would probably have more luck finding an answer on a Plesk-related forum. For example, I found this post - perhaps it’s a solution for your problem?