Can't access site after migration to joomla 4.x

[pluktuin]

After migration to joomla 4 I can't open my website and I receive a lot of faultmessages. I started with the faults from the document: joomla 4 start fault.
I tried to fixe this faults. But everytime I change something I get a new faultmessage.
After changing a lot. The faultmessage I have at the moment are the ones in the document: foutmelding joomla 4

I googled that I should change isSite() to isClient('Site') but he still says that he doesn't recognize this function.
Can anyone help me to solve this problem?

thanks,

Petra

[toivo]

Welcome to the Joomla forum!

The system plugin Googlemap3 is not compatible with Joomla 4. Rename the file plugins/system/plugin_googlemap3/plugin_googlemap3.php or disable the plugin by locating the row in the table extensions and changing the column 'enabled' from 1 to 0.

[pluktuin]

Toivo: thank you for your quick reply. I have renames plugin_googlemap3.php
I got a new fault message. With I don't know what to do with. Could you also help me with this message?

[toivo]

Looks like another incompatible extension but there is not enough information to identify it.

Please post the results from the Forum Post Assistant (FPA) by following the instructions at https://forumpostassistant.github.io/docs so that our volunteer Joomla experts can review the configuration.

Do you have a full backup, created before the site was migrated? It might be easier to restore the website into an empty main folder and a new database schema, then run the FPA and post the results here for assessment.

[pluktuin]

Toivo: thank you. I will try to do this tomorrow. (when I have had a good sleep and can look at the problem fresly).

[pe7er]

Issues after migration are usually caused by 3rd party System or Content Plugins, and template overrides in the front-end template.

Can you switch on the Debug Mode to see the full stack trace with the error?
In your configuration.php change
public $debug = false;
to
public $debug = true;

[Slackervaara]

From the latest error message it seems to be a module not compatible with Joomla 4. The precheck does not detect all. For me SSL Fixer halted the migration.

[pluktuin]

I have turned on the debug mode. See messages

After renaming plugin_googlemap3.php I could enter de administrator site. But still a lot of bugs when I want to run my website.
I can’t enter administrator site anymore after turning on j2xml export sent button extension

I can’t run FPA-en.php I have installed it in the same directory as the config.php

I installed a new joomla4 db and website. I installed akeeba-backup extension in it.
I tried to run kickstart to return older joomla3 website in it, but it doesn’t run the kickstart.

What do you mean with SSL Fixer block's it? How do I solve this?

[Slackervaara]

During the migration there was a stop and it was caused by SSL Fixer according to error log. I uninstalled SSL Fixer and the migration completed.

[pluktuin]

For the site with the joomla3 migration to joomla4
(/joomla_01 website pluktuindebosrand.nl)

I'm sorry but I don't understand what you have done with the SSL Fixer and what I should do? It's not running and I can't enter front or backend.
The one option to restoring an old working joomla 3 website to an empty joomla 4 website resolved in that he changed the joomla 4 version to joomla 3.9 (joomla_05 website joomla4.pluktuindebosrand.nl)

Before migration to joomla4 I made backups with akeeba backup. I can't find these backups in my directory. Where can I find these akeeba backups?

[Slackervaara]

I mentioned SSL Fixer to show that I got identical problem as you because SSL Fixer was only for Joomla 3. You probably have a module that is not adapted to Joomla 4. Probably its a third party module. If you remember your modules you could check Joomla Extension Directory if they are for Joomla 4. If you disable this module you will be able to access your site unless there is more errors.
https://extensions.joomla.org/extension

[pluktuin]

After 3 days of frustration to try to let the former joomla4 migrations work I decided to start from scratch with a working joomla 3.10 website. I disabled all the in the pre-check mentioned plugins and run the live-update check. That didn’t see any problems, so I started the update. It didn’t finish the update, but came with the following fault messages (see doc). It looks like something with SQL?
Anyone who can help me solve this?

In case the problems with my earlier attempts are easier to solve? I kept all the earlier joomla 4 update trials.

[Slackervaara]

Have you checked this:
If you migrated from Joomla! 2.5 to 3.x in the past, there may be some leftover extensions that need to be cleaned up. The following are older 2.5 or 3.x extensions that need to be uninstalled before updating to Joomla 4:

plg_content_geshi
Bluestork Administrator Template
Beez_20
Beez5
Atomic
When it comes to templates, uninstall all core frontend or backend templates except Protostar and Beez3 (frontend templates) and Isis or Hathor (administrator templates)