Issue Cloning WordPress instance failed - Failed to reset cache for the instance

[Christopher-James]

Server operating system version

CentOS Linux 7.9.2009 (Core)

Plesk version and microupdate number

Plesk Obsidian 18.0.51

Ive had this multiple times, ive searched all the forums with no resolution.

Clearing the cache with

plesk ext wp-toolkit --clear-cache -instance-id 9

just returns the following error

Failed to reset cache for the instance #9, reason: An error has occurred when decoding JSON: Decoding failed: Syntax error
Failed to reset cache for the instance #9: An error has occurred when decoding JSON: Decoding failed: Syntax error
exit status 3

All I'm trying to do is clone an instance

I need help

This is the error i see in the log files

Long task executor: id=14245 completed with error: Failed to reset cache for the instance #9: An error has occurred when decoding JSON: Decoding failed: Syntax error:
0: /usr/local/psa/admin/plib/Task/Async/Executor.php:46
    Task_Async_Executor->execute()
1: /usr/local/psa/admin/plib/scripts/task-async-executor.php:6

Failed to reset cache for the instance #9: An error has occurred when decoding JSON: Decoding failed: Syntax error

 

[Peter Debik]

This issue is normally caused by a plugin or a theme that has a bug. You can find details here:

https://support.plesk.com/hc/en-us/articles/12377006083735

 

[Christopher-James]

This issue is normally caused by a plugin or a theme that has a bug. You can find details here:

https://support.plesk.com/hc/en-us/articles/12377006083735

Hi @Peter Debik, thanks for this but I've already looked through this and all this seems to do I list the plugins/themes that are used in the instance, it doesnt provide any other info I don't have already or am I missing something?

 

[Peter Debik]

How to find out the plugin or theme:

1) Change current dir to website document root:
# cd /var/www/vhosts/example.com/httpdocs/

2) Download official WP-CLI from Wordpress: WP-CLI | WP-CLI

3) Run command on behalf of system user and using PHP version from domain use "theme list" or "plugin list" depending on what you want to check:
# sudo -u example /opt/plesk/php/7.4/bin/php ./wp-cli.phar theme list --fields=name --format=json

4) If any html code output except JSON body like below returned this means you have buggy plugin/theme, for example:
[{"name":"flatsome"},{"name":"twentytwenty"}]

or open a support ticket and ask for assistance:

How to get support directly from Plesk? - Support Cases from Plesk Knowledge Base

How to get support directly from Plesk? - Support Cases - Plesk Knowledge Base

www.plesk.com