Could not load model design/banner

Hi, i'm new here, i tried to install opencart but when the installation is completed and i try to view my shop, there is an error.
This is the error:
Fatal error: Uncaught exception 'Exception' with message 'Error: Could not load model design/banner!' in /home/ubuntu/workspace/system/engine/loader.php on line 60 Exception: Error: Could not load model design/banner! in /home/ubuntu/workspace/system/engine/loader.php on line 60 Call Stack: 0.0025 234832 1. {main}() /home/ubuntu/workspace/index.php:0 0.0034 264344 2. start() /home/ubuntu/workspace/index.php:19 0.0034 266648 3. require_once('/home/ubuntu/workspace/system/framework.php') /home/ubuntu/workspace/system/startup.php:104 0.0212 383224 4. Router->dispatch() /home/ubuntu/workspace/system/framework.php:168 0.0290 577008 5. Router->execute() /home/ubuntu/workspace/system/engine/router.php:29 0.0290 577008 6. Action->execute() /home/ubuntu/workspace/system/engine/router.php:34 0.0290 581232 7. call_user_func_array:{/home/ubuntu/workspace/system/engine/action.php:51}() /home/ubuntu/workspace/system/engine/action.php:51 0.0290 581672 8. ControllerStartupRouter->index() /home/ubuntu/workspace/system/engine/action.php:51 0.0293 592352 9. Action->execute() /home/ubuntu/workspace/catalog/controller/startup/router.php:25 0.0293 596568 10. call_user_func_array:{/home/ubuntu/workspace/system/engine/action.php:51}() /home/ubuntu/workspace/system/engine/action.php:51 0.0293 597296 11. ControllerCommonHome->index() /home/ubuntu/workspace/system/engine/action.php:51 0.1905 1391112 12. Loader->controller() /home/ubuntu/workspace/catalog/controller/common/home.php:14 0.1906 1398376 13. Action->execute() /home/ubuntu/workspace/system/engine/loader.php:24 0.1906 1402480 14. call_user_func_array:{/home/ubuntu/workspace/system/engine/action.php:51}() /home/ubuntu/workspace/system/engine/action.php:51 0.1906 1403760 15. ControllerCommonContentTop->index() /home/ubuntu/workspace/system/engine/action.php:51 0.1915 1411944 16. Loader->controller() /home/ubuntu/workspace/catalog/controller/common/content_top.php:63 0.1916 1419800 17. Action->execute() /home/ubuntu/workspace/system/engine/loader.php:24 0.1917 1424240 18. call_user_func_array:{/home/ubuntu/workspace/system/engine/action.php:51}() /home/ubuntu/workspace/system/engine/action.php:51 0.1917 1425536 19. ControllerExtensionModuleSlideshow->index() /home/ubuntu/workspace/system/engine/action.php:51 0.1917 1425872 20. Loader->model() /home/ubuntu/workspace/catalog/controller/extension/module/slideshow.php:6

'Error: Could not load model design/banner!' in ...
that's usually, if / because the
catalog/model/design/banner.php file does not exist, for what reason ever...
Ernie