Package phpunit/phpunit-mock-objects is abandoned, you should avoid using it. No replacement was suggested.

[pjp-comp]

After a fresh setup of 3.7.4 Red Velvet
trying to install this theme using composer in command prompt. it giving following message

$ composer require maiconpinto/cakephp-adminlte-theme
Using version ^1.1 for maiconpinto/cakephp-adminlte-theme
./composer.json has been updated
Loading composer repositories with package information
Updating dependencies (including require-dev)
Nothing to install or update
Package phpunit/phpunit-mock-objects is abandoned, you should avoid using it. No replacement was suggested.
Generating autoload files
> Cake\Composer\Installer\PluginInstaller::postAutoloadDump

if i ignore this and following set up as per your given steps, on open project, it shows "internal server error""internal server error"

[maiconpinto]

Hi @pjp-comp I will test this version.

[hassisto]

Had the same problem with mine fresh installation of CakePHP 3.7.5 , solved adding
// config/bootstrap.php

Plugin::load('AdminLTE', ['bootstrap' => true, 'routes' => true]);