Migrations plugin won't load ! :(

hi guys i'm trying to install the Migrations plugin in my cakePHP App but it wont work i did all the steps on the github documentation but when i run the command : 

cake Migrations.migration run all -p Migrations
i get the message : 

Error: Plugin Migrations could not be found.
#0 C:\wamp\www\Plugins installed\lib\Cake\Core\App.php(365): CakePlugin::path('M
igrations')
#1 C:\wamp\www\Plugins installed\lib\Cake\Core\App.php(226): App::pluginPath('Mi
grations')
#2 C:\wamp\www\Plugins installed\lib\Cake\Core\App.php(547): App::path('Console/
Command', 'Migrations')
#3 [internal function]: App::load('MigrationShell')
#4 [internal function]: spl_autoload_call('MigrationShell')
#5 C:\wamp\www\Plugins installed\lib\Cake\Console\ShellDispatcher.php(247): clas
s_exists('MigrationShell')
#6 C:\wamp\www\Plugins installed\lib\Cake\Console\ShellDispatcher.php(198): Shel
lDispatcher->_getShell('Migrations.migr...')
#7 C:\wamp\www\Plugins installed\lib\Cake\Console\ShellDispatcher.php(66): Shell
Dispatcher->dispatch()
#8 C:\wamp\www\Plugins installed\lib\Cake\Console\cake.php(49): ShellDispatcher:
:run(Array)
#9 {main}

please help 

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