whats wrong with my syntax?

[ImRobbieRobski]

user@ec1:~/html/shell$ php -f modman_files.php -- --Bytes_ImageCheck=Mage_Catalog --prefix="app/code/local"
Option [module_name] is required

What am I doing wrong>

[toluolubajo]

use php -f modman_files.php -- --module_name=Bytes_ImageCheck --prefix="your_custom_dir"

[ImRobbieRobski]

What is the custom dir is that where they are normally intsalled in magento or where I want it copied to (ie .modman)

user@ec1:~/html/shell$ php -f modman_files.php -- --module_name=Bytes_ImageCheck --prefix="app/code/local"
PHP Fatal error: Uncaught exception 'Mage_Core_Exception' in /home/user/html/app/Mage.php:595
Stack trace:
#0 /home/user/html/.modman/modman-magefiles-master/lib/generator.php(119): Mage::throwException(false, '/home/user...')
#1 /home/user/html/.modman/modman-magefiles-master/modman_files.php(185): MageHack_Shell_Modman_Generator->setDesignConfigXmlFile('imagecheck.xml')
#2 /home/user/html/.modman/modman-magefiles-master/modman_files.php(60): MageHack_Shell_Modman_Files->_getAllFiles('Bytes_ImageChec...')
#3 /home/user/html/.modman/modman-magefiles-master/modman_files.php(390): MageHack_Shell_Modman_Files->run()
#4 {main}
thrown in /home/user/html/app/Mage.php on line 595