Undefined indexes in tmgmt_entity_ui.pages.inc

Hi, following the tutorial, at http://drupal.org/node/1509628 (entity source page), after enabling tmgmt_entity_ui for the first time, I've got the following errors at node/2/translate

    Notice: Undefined index: #entity_type en tmgmt_entity_ui_translate_form() (línea 15 de /home/checkout/l10n_client/sites/all/modules/custom/tmgmt/sources/entity/ui/tmgmt_entity_ui.pages.inc).
    Notice: Undefined index: #entity en tmgmt_entity_ui_translate_form() (línea 16 de /home/checkout/l10n_client/sites/all/modules/custom/tmgmt/sources/entity/ui/tmgmt_entity_ui.pages.inc).
    Notice: Undefined index: entity keys en entity_extract_ids() (línea 7533 de /home/checkout/l10n_client/includes/common.inc).
    Notice: Undefined index: entity keys en entity_extract_ids() (línea 7534 de /home/checkout/l10n_client/includes/common.inc).
    Notice: Trying to get property of non-object en tmgmt_entity_ui_translate_form() (línea 31 de /home/checkout/l10n_client/sites/all/modules/custom/tmgmt/sources/entity/ui/tmgmt_entity_ui.pages.inc).
    Notice: Trying to get property of non-object en tmgmt_entity_ui_translate_form() (línea 40 de /home/checkout/l10n_client/sites/all/modules/custom/tmgmt/sources/entity/ui/tmgmt_entity_ui.pages.inc).
    Notice: Trying to get property of non-object en tmgmt_entity_ui_translate_form() (línea 40 de /home/checkout/l10n_client/sites/all/modules/custom/tmgmt/sources/entity/ui/tmgmt_entity_ui.pages.inc).

Maybe related, on the same page, when clicking on "Request translation" for spanish, I got the following error:

( ! ) Fatal error: Class name must be a valid object or a string in /home/checkout/l10n_client/includes/common.inc on line 7656
Call Stack
#	Time	Memory	Function	Location
1	0.0016	632840	{main}( )	../index.php:0
2	0.2509	33628192	menu_execute_active_handler( )	../index.php:21
3	0.2525	33884784	call_user_func_array ( )	../menu.inc:516
4	0.2525	33885208	entity_ui_get_form( )	../menu.inc:0
5	0.2543	34184848	drupal_build_form( )	../entity.module:1081
6	0.2543	34187592	drupal_retrieve_form( )	../form.inc:339
7	0.2584	34886824	call_user_func_array ( )	../form.inc:795
8	0.2584	34887536	tmgmt_job_form( )	../form.inc:0
9	1.9723	42623360	view->preview( )	../tmgmt_ui.pages.inc:328
10	1.9927	44750448	views_plugin_display->preview( )	../view.inc:1267
11	1.9927	44750496	view->render( )	../views_plugin_display.inc:2601
12	2.0071	45623912	views_plugin_display->render( )	../view.inc:1181
13	2.0096	46072256	theme( )	../views_plugin_display.inc:2533
14	2.0114	46570272	template_preprocess_views_view( )	../theme.inc:1024
15	2.0114	46570272	views_plugin_style->render( )	../theme.inc:51
16	2.0114	46570320	views_plugin_style->render_grouping( )	../views_plugin_style.inc:284
17	2.0114	46570320	views_plugin_style->render_fields( )	../views_plugin_style.inc:389
18	2.0115	46572216	views_handler_field->theme( )	../views_plugin_style.inc:484
19	2.0115	46574512	theme( )	../views_handler_field.inc:1390
20	2.0116	46576112	template_preprocess_views_view_field( )	../theme.inc:1024
21	2.0116	46576112	views_handler_field->advanced_render( )	../theme.inc:354
22	2.0116	46576112	tmgmt_handler_field_tmgmt_entity_label->render( )	../views_handler_field.inc:1011
23	2.0116	46576112	Entity->label( )	../tmgmt_handler_field_tmgmt_entity_label.inc:14
24	2.0116	46576112	TMGMTJobItem->defaultLabel( )	../entity.inc:123
25	2.0124	46604936	TMGMTEntitySourcePluginController->getLabel( )	../tmgmt.entity.inc:310
26	2.0124	46604936	entity_load_single( )	../tmgmt_entity.plugin.inc:11
27	2.0124	46605240	entity_load( )	../entity.module:126
28	2.0124	46605504	entity_get_controller( )	../common.inc:7623