```ruby
require 'require_all'
require_rel 'core_ext'
require_rel 'virtualbox/configuration'
require_rel 'virtualbox/exceptions'
require_rel 'virtualbox/webservice'
require_rel 'virtualbox/base'
require_rel 'virtualbox/classes/websession_manager'
```

Reorder files requiring in main script
user
```ruby
require 'require_all'
require_rel 'core_ext'
require_rel 'virtualbox/base'
require_rel 'virtualbox/configuration'
require_rel 'virtualbox/exceptions'
require_rel 'virtualbox/webservice'
require_rel 'virtualbox/classes/websession_manager'
```
assistant