0 Class "Joomla\Plugin\System\Schemaorg\Extension\Schemaorg" not found Topic is solved

[4thdesign1]

So a new installation of Joomla 5.2.3 on a domain that used to have Joomla 3. I removed all files before upload via FTP.

Uploading went smoothly, but now the website in the adminsitration side says the following error:
0 Class "Joomla\Plugin\System\Schemaorg\Extension\Schemaorg" not found

On the front end of the website, it says Requested page cannot be found and at the end of the messages, it says the same error - 0 Class "Joomla\Plugin\System\Schemaorg\Extension\Schemaorg" not found

Aha I thought, I will just upload over the top, the particular plugin and have it overwrite what is already there, did that, makes no difference. Even though in FTP, I can see the plugin and corresponding files, the website can't seem to acknowledge its there.

Can ANYONE help me with this please? Whats going on??

[4thdesign1]

RESOLVED..... even though I couldnt find a fix using the search option on these forums, something I remembered from ages ago

Go to Administrator on your FTP and find the Cache folder...... and then delete autoload_psr4.php

Reload your website, and its all good to go.

Just helping someone else out on here if they do a search to find a resolution to the same problem.