Custom module is present but not read by Apache (?)

Anonymous Monk has asked for the wisdom of the Perl Monks concerning the following question:

Hi Monks, I am trying to migrate a server that uses cgi-bin and I am running into problems, because a "use" statement does not see the modules that it is trying to access. More specifically: Apache log error

AH01215: Can't locate Error.pm in @INC (@INC contains: /srv/www/Direct
+/perl-lib /usr/local/lib64/perl5 /usr/local/share/perl5 /usr/lib64/pe
+rl5/vendor_perl /usr/share/perl5/vendor_perl /usr/lib64/perl5 /usr/sh
+are/perl5 .
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However:

/srv/www/Direct/perl-lib/Portal
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give me:

ConfigError.pm
DataIntegrityError.pm
Error.pm
JSTypeError.pm
Page.pm
SessionExpiredError.pm
TypeError.pm
DatabaseError.pm
DebugError.pm
FileSizeError.pm
LockError.pm
PermissionError.pm
SystemError.pm
[download]

so, Error.pm exists! Furthermore, the login page that is producing the error has:

use lib '/srv/www/Direct/perl-lib';
use Portal::Page; 
use Portal::Error;
use Portal::PermissionError;
use Portal::DatabaseError;
use Portal::SessionExpiredError;
use DirectWeb::Database;
use DirectWeb::Authenticator;
use Error qw(:try);
use CGI;
use CGI::Cookie;
use Log::Handler;
use URI::Escape;
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which, in my mind, means that the custom lib folder is declared explicitly, but @INC does not see it (?) Am I doing something wrong here?

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