I find your joomla extensions ReReplace and DB Replace. One of them (pro version) I need for correct migration problems.
Now i want try your free version in my new joomla 5.0.3., but after install I get error:
Failed opening required '..../administrator/cache/autoload_psr4.php' (include_path='.:/usr/share/php')
I try your development relace (DB Replace) toot, but it dont help.
I clear cache too ... and try reinstall too. Dont help.
Can you give me (super) admin and (s)ftp access so I can take a look?
And tell me on what url I can see/reproduce the issue.
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Yes, in my live site I have more 3rd party extensions (Akeeba Backup, JCH Optimizer, Gallery, Mega Filter, and other).
I have problem only with Regular Labs extensions ReReplace and DB Replace.
What is a probelm?
During the installation, the Regular Labs Library gets installed first. It then asks Joomla to recreate the namespace file, so that the installation of the rest of the extension doesn't run into namespace issues.
This works fine on pretty much all setups.
It looks like that on your server, the file is not ready for reading just after the namespace file is recreated, and then throws the error.
This looks like a server issue. Not much I can do about it.