Upgrade 8.4.2 to 9.0.2

[yuri]

> It seems that the problem is caused by my custom entry points located in custom/Espo/Custom/EntryPoints/

What exactly was in the problem file? It loaded the library code.

[DashingUno]

yuri

As far as I understand, the issue is the mising required files as mentioned before?
Should we just manually add them to the EspoCRM-upgrade-8.4.2-to-9.0.2.zip\vendorFiles\paragonie\random_compat\lib and be done with it
Or will this be included in official version later down the line?

Whats the correct course of action for us here?

[yuri]

I don't think it's because of missing files. The v9.0 has breaking changes. Before upgrading, the script goes though custom files to check for incompatible usages. To avoid the system complete crash after upgrade, to prompt the user to fix incompatibilities first.

It looks like some custom file includes the library code. Maybe though the "use" statement in the beginning of the file.

[yuri]

Try uninstalling TCPDF extension, upgrade and then install it back.

[shalmaxb]

My experience with third party extensions:

Sometimes the uninstall routine in Admin does not uninstall certain extensions completely. So after having uninstalled from the GUI go to the folders client/custom/modules and custom/modules to see if there is anything from one of the uninstalled extensions still present. Delete these files.
Have a look in your database table "extensions" and delete as well all rests of those extensions.
Rebuild your instance. In many cases this already solves such problems as described.

After that, re-install your extensions one by one and see if all works well. If one extension starts to cause the problem again, it is likely a compatibility issue with the upgraded espoCRM version and the developer of that extension should take a look at that.