Issue after update from V3>V4>V5>V6 CustomerUserGeneric.pm

[alfl]

I upgraded from version 3.3.20 to version 6.0.28

All worked but it is definitely not easy to do because of all kind of database issues, but i have one last error which i can't seem to resolve

every time i create a ticket or reply a ticket or even open a ticket i got the following error message :
OTRS detected possible network issues. You could either try reloading this page manually or wait until your browser has re-established the connection on its own.

In the apache error log i can see that the module CustomerUserGeneric.pm is trying to get loaded but can't be found at its location

Message: Can't locate Kernel/Output/HTML/CustomerUserGeneric.pm in @INC (you may need to install the Kernel::Output::HTML::CustomerUserGeneric module) (@INC contains: /opt/otrs/Custom /opt/otrs/Kernel/cpan-lib /opt/otrs/ /etc/perl /usr/local/lib/x86_64-linux-gnu/perl/5.22.1 /usr/local/share/perl/5.22.1 /usr/lib/x86_64-linux-gnu/perl5/5.22 /usr/share/perl5 /usr/lib/x86_64-linux-gnu/perl/5.22 /usr/share/perl/5.22 /usr/local/lib/site_perl . /etc/apache2) at /opt/otrs/Kernel/System/Main.pm line 85.


I checked and the file is not there, but if i copy the original file from backup 3.3.20 to this location i get error:
Message:
[:error] [pid 23054] [Wed Jul 1 12:13:37 2020] -e: Got no ConfigObject! at /opt/otrs/Kernel/Output/HTML/CustomerUserGeneric.pm line 23.\n

which i can imagine because of the difference between the versions

How can i resolve this error ?

[zzz]

You can't just copy files from older versions into your system.
That's a file from version 3/4 and is not needed anymore.

Check your system configuration and the Config.pm for 'CustomerUserGeneric' references and remove/fix those settings.

— Emin

[alfl]

Ok, i searched for CustomerUserGeneric in the SystemConfiguration and found 2 items

Frontend::CustomerUser::Item###1-GoogleMaps
Frontend::CustomerUser::Item###15-OpenTickets

I disabled these and the error is gone, but do i need to just disable them or do i need to change kernel module which referenced to the following:
Kernel::Output::HTML::CustomerUserGeneric
Kernel::Output::HTML::CustomerUserGenericTicket

[zzz]

You don't even need to disable them, you can just reset these settings and it will automatically fix it for you.
You most likely made some changes to these settings leading to them not getting updated correctly.

— Emin

[alfl]

Ah, i didn't notice the 'reset settings' button on top of each setting to reset to the default values.

I reset the settings to the defaults and the errors are still gone as is the pop up, so thanks for the quick support and answers.