hi all, when i go to my items it crash: JUser::_load: Unable to load user with id: 1

mail:
( ! ) Notice: Undefined offset: 1 in I:\proyectosApache\jluis\libraries\joomla\html\html\email.php on line 36
Call Stack
# Time Memory Function Location
1 0.0006 74624 {main}( ) ..\index.php:0
2 0.1062 4051344 JSite->dispatch( ) ..\index.php:68
3 0.1178 4395432 JComponentHelper->renderComponent( ) ..\application.php:124
4 0.1220 4517536 require_once( 'I:\proyectosApache\jluis\components\com_k2\k2.php' ) ..\helper.php:162
5 0.1532 6803736 JController->execute( ) ..\k2.php:43
6 0.1532 6804440 K2ControllerItemlist->display( ) ..\controller.php:236
7 0.1658 7501008 JController->display( ) ..\itemlist.php:27
8 0.1716 7774728 JCacheView->get( ) ..\controller.php:308
9 0.1719 7818544 K2ViewItemlist->display( ) ..\view.php:98
10 0.2244 8447056 JView->display( ) ..\view.html.php:278
11 0.2244 8447056 JView->loadTemplate( ) ..\view.php:192
12 0.2277 8525464 include( 'I:\proyectosApache\jluis\components\com_k2\templates\user.php' ) ..\view.php:564
13 0.2281 8528272 JHTML->_( ) ..\user.php:52
14 0.2303 8556208 call_user_func_array ( ) ..\html.php:87
15 0.2303 8556296 JHTMLEmail::cloak( ) ..\html.php:0
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