Trying to update to 6.x error 500

sergiosp

I need help:
I've tried to update my Joomla site from 5.4.3 to 6.x. The system asks me to unpublish 'System - Manage - Plugins', but when I do, I get the following error:
In the backend it says: 0 Class "JPlugin" not found
In the frontend: Sorry, there was a problem we could not recover from. [upl-image-preview
The server returned a "500 - Whoops, looks like something went wrong."

I've attached an image to illustrate what's happening.
Can you help me solve this?

Sergio

saguaros

sergiosp Hi Sergio,

The URL of your site seems not working, could you check again?

sergiosp

Hi saguaros!
I apologize, I made a typo, I just corrected it
Sergio

saguaros

sergiosp Hi Sergio,

I checked your website and found that some plugins are not compatible with your current Joomla version. To prevent conflicts, I temporarily renamed the following plugin folders:
• JROOT/plugins/system/osgallery_system/
• JROOT/plugins/content/phocadownload/

I also updated the following file in the JA Morgan template:
• JROOT/templates/ja_morgan/html/com_content/featured/default.php

defaultphp.zip

2kB

Please review all extensions on your website and check if newer versions are available for Joomla 5/6. Make sure to update them accordingly.

Regards,

sergiosp

Thanks saguaros & team!
Sergio

sergiosp

Dear Saguaros,
I've updated Joomla from 5.4.x to 6.x.
I've also updated the extensions.
I'm having problems with the JoomlArt Advanced Custom Module; its aesthetic design is disappearing. For example, "Features Intro: style-6" doesn't display correctly. Can you tell me what to do?
Thanks
Sergio
.