An illegal choice has been detected. Please contact the site administrator

Looks like Entity reference view not support OG group ID just like my screenshot in attachment entityreference_view.JPG

Dev, would you please address this issue?

Many thanks

If we get following entity selection view, It will get error:

$view = new view();
$view->name = 'reference_album';
$view->description = '';
$view->tag = 'default';
$view->base_table = 'node';
$view->human_name = 'reference album';
$view->core = 7;
$view->api_version = '3.0';
$view->disabled = FALSE; /* Edit this to true to make a default view disabled initially */

/* Display: Master */
$handler = $view->new_display('default', 'Master', 'default');
$handler->display->display_options['use_more_always'] = FALSE;
$handler->display->display_options['access']['type'] = 'perm';
$handler->display->display_options['cache']['type'] = 'none';
$handler->display->display_options['query']['type'] = 'views_query';
$handler->display->display_options['exposed_form']['type'] = 'basic';
$handler->display->display_options['pager']['type'] = 'full';
$handler->display->display_options['style_plugin'] = 'default';
$handler->display->display_options['row_plugin'] = 'fields';
/* Relationship: OG membership: OG membership from Node */
$handler->display->display_options['relationships']['og_membership_rel']['id'] = 'og_membership_rel';
$handler->display->display_options['relationships']['og_membership_rel']['table'] = 'node';
$handler->display->display_options['relationships']['og_membership_rel']['field'] = 'og_membership_rel';
/* Field: Content: Title */
$handler->display->display_options['fields']['title']['id'] = 'title';
$handler->display->display_options['fields']['title']['table'] = 'node';
$handler->display->display_options['fields']['title']['field'] = 'title';
$handler->display->display_options['fields']['title']['label'] = '';
$handler->display->display_options['fields']['title']['alter']['word_boundary'] = FALSE;
$handler->display->display_options['fields']['title']['alter']['ellipsis'] = FALSE;
/* Sort criterion: Content: Post date */
$handler->display->display_options['sorts']['created']['id'] = 'created';
$handler->display->display_options['sorts']['created']['table'] = 'node';
$handler->display->display_options['sorts']['created']['field'] = 'created';
$handler->display->display_options['sorts']['created']['order'] = 'DESC';
/* Contextual filter: OG membership: Group ID */
$handler->display->display_options['arguments']['gid']['id'] = 'gid';
$handler->display->display_options['arguments']['gid']['table'] = 'og_membership';
$handler->display->display_options['arguments']['gid']['field'] = 'gid';
$handler->display->display_options['arguments']['gid']['relationship'] = 'og_membership_rel';
$handler->display->display_options['arguments']['gid']['default_action'] = 'default';
$handler->display->display_options['arguments']['gid']['default_argument_type'] = 'og_context';
$handler->display->display_options['arguments']['gid']['summary']['number_of_records'] = '0';
$handler->display->display_options['arguments']['gid']['summary']['format'] = 'default_summary';
$handler->display->display_options['arguments']['gid']['summary_options']['items_per_page'] = '25';
$handler->display->display_options['arguments']['gid']['specify_validation'] = TRUE;
$handler->display->display_options['arguments']['gid']['validate']['type'] = 'og';
/* Filter criterion: Content: Published */
$handler->display->display_options['filters']['status']['id'] = 'status';
$handler->display->display_options['filters']['status']['table'] = 'node';
$handler->display->display_options['filters']['status']['field'] = 'status';
$handler->display->display_options['filters']['status']['value'] = 1;
$handler->display->display_options['filters']['status']['group'] = 1;
$handler->display->display_options['filters']['status']['expose']['operator'] = FALSE;
/* Filter criterion: Content: Type */
$handler->display->display_options['filters']['type']['id'] = 'type';
$handler->display->display_options['filters']['type']['table'] = 'node';
$handler->display->display_options['filters']['type']['field'] = 'type';
$handler->display->display_options['filters']['type']['value'] = array(
'yut_musicteam_album' => 'yut_musicteam_album',
);

/* Display: Entity Reference */
$handler = $view->new_display('entityreference', 'Entity Reference', 'entityreference_1');
$handler->display->display_options['defaults']['title'] = FALSE;
$handler->display->display_options['pager']['type'] = 'some';
$handler->display->display_options['defaults']['style_plugin'] = FALSE;
$handler->display->display_options['style_plugin'] = 'entityreference_style';
$handler->display->display_options['style_options']['search_fields'] = array(
'title' => 'title',
);
$handler->display->display_options['defaults']['style_options'] = FALSE;
$handler->display->display_options['defaults']['row_plugin'] = FALSE;
$handler->display->display_options['row_plugin'] = 'entityreference_fields';
$handler->display->display_options['defaults']['row_options'] = FALSE;

/* Display: Page */
$handler = $view->new_display('page', 'Page', 'page_1');
$handler->display->display_options['path'] = 'node/%/testpages';
$handler->display->display_options['menu']['type'] = 'tab';
$handler->display->display_options['menu']['title'] = 'Test';
$handler->display->display_options['menu']['weight'] = '0';
$handler->display->display_options['menu']['context'] = 0;
$translatables['reference_album'] = array(
t('Master'),
t('more'),
t('Apply'),
t('Reset'),
t('Sort by'),
t('Asc'),
t('Desc'),
t('Items per page'),
t('- All -'),
t('Offset'),
t('« first'),
t('‹ previous'),
t('next ›'),
t('last »'),
t('OG membership from node'),
t('All'),
t('Entity Reference'),
t('Page'),
);