Help - Issue after update from V4>V5>V6

[vernum]

Hello,

We are facing an issue with OTRS v6, when we load a ticket in our web brower we face an "Network error", so I had a look in apache2 logs and founds errors below

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 RequestURI: /otrs/index.pl

 Traceback (6617):
   Module: Kernel::Output::HTML::Layout::Ticket::AgentCustomerViewTable Line: 336
   Module: Kernel::Output::HTML::TicketZoom::CustomerInformation::Run Line: 34
   Module: Kernel::Modules::AgentTicketZoom::Run Line: 452
   Module: Kernel::System::Web::InterfaceAgent::Run Line: 1116
   Module: ModPerl::ROOT::ModPerl::Registry::opt_otrs_bin_cgi_2dbin_index_2epl::handler Line: 38
   Module: (eval) (v1.99) Line: 207
   Module: ModPerl::RegistryCooker::run (v1.99) Line: 207
   Module: ModPerl::RegistryCooker::default_handler (v1.99) Line: 173
   Module: ModPerl::Registry::handler (v1.99) Line: 32

[Mon Nov 19 10:44:13.551678 2018] [:error] [pid 6617:tid 140508244408064] [Mon Nov 19 10:44:13 2018] -e: 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/5.20.2 /usr/local/share/perl/5.20.2 /usr/lib/x86_64-linux-gnu/perl5/5.20 /usr/share/perl5 /usr/lib/x86_64-linux-gnu/perl/5.20 /usr/share/perl/5.20 /usr/local/lib/site_perl . /etc/apache2) at /opt/otrs/Kernel/System/Main.pm line 82.<br/>\n

When we try to backup the old files "CustomerUserGeneric .pm" from our older OTRS, OTRS go down "Server internal error".

Did someone faced an error like this ?
We tried to rebuild and clean up without any success.

[vernum]

When we set all the files and start a reconfiguration we face this error :

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Got no ConfigObject! at /opt/otrs/Kernel/Output/HTML/ToolBarLink.pm

Is the migration from V4 to V5 can have failed without any error message ?

[vernum]

Ok, we update manually the ZZZAuto.pm file to match the new HTML path.