Somewhere, the wrong version of List::Util gets picked up. Maybe there is 1.38 somewhere in @INC and the 1.49 does not get picked up because file system permissions prohibit it.

I recommend trying a simpler approach by reducing the problem and eliminating Mojolicious and Moose and instead running a simple program to find out which file gets loaded and expanding from there until you locate the actual problem. Start out with something like:

#!perl -w
use strict;
use List::Util;
use Data::Dumper;

warn List::Util->VERSION;
warn $INC{ "List/Util.pm" };
warn Dumper \%INC;
warn Dumper \@INC;
warn "Perl $^W";
warn "Perl Version $]";
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This should point you to the 1.38 version. If it outputs the 1.49 version, then something else updates @INC, or your code is run by a version of Perl that you did not install 1.49 into. Check and correct until you have found the difference between your program, your expectation and the Mojolicious program.