Fatal Error in PHP.include_once();

Declaration of UserModel::Delete($UserID, $Options = Array) should be compatible with Gdn_Model::Delete($Where = '', $Limit = false, $ResetData = false)

The error occurred on or near: /home/willwh5/public_html/dragonpulls/vanilla_forum/applications/dashboard/models/class.usermodel.php

 7: You should have received a copy of the GNU General Public License along with Garden.  If not, see <http://www.gnu.org/licenses/>.
 8: Contact Vanilla Forums Inc. at support [at] vanillaforums [dot] com
 9: */
10: 
11: class UserModel extends Gdn_Model {
12:    const DEFAULT_CONFIRM_EMAIL = 'You need to confirm your email address before you can continue. Please confirm your email address by clicking on the following link: {/entry/emailconfirm,exurl,domain}/{User.UserID,rawurlencode}/{EmailKey,rawurlencode}';
13:    const USERID_KEY = 'user.{UserID}';
14:    const USERNAME_KEY = 'user.{Name}.name';
15:    const USERROLES_KEY = 'user.{UserID}.roles';

Backtrace:

[/home/willwh5/public_html/dragonpulls/vanilla_forum/applications/dashboard/models/class.usermodel.php:11] PHP::Gdn_ErrorHandler();
[/home/willwh5/public_html/dragonpulls/vanilla_forum/library/core/class.autoloader.php:264] PHP::include_once();
[/home/willwh5/public_html/dragonpulls/vanilla_forum/library/core/class.autoloader.php:264] Gdn_Autoloader::Lookup();
[/home/willwh5/public_html/dragonpulls/vanilla_forum/library/core/class.autoloader.php:264] PHP::spl_autoload_call();
[/home/willwh5/public_html/dragonpulls/vanilla_forum/library/core/class.factory.php:54] PHP::class_exists();
[/home/willwh5/public_html/dragonpulls/vanilla_forum/library/core/class.gdn.php:156] Gdn_Factory->Factory();
[/home/willwh5/public_html/dragonpulls/vanilla_forum/library/core/class.gdn.php:510] Gdn::Factory();
[/home/willwh5/public_html/dragonpulls/vanilla_forum/library/core/class.auth.php:328] Gdn::UserModel();
[/home/willwh5/public_html/dragonpulls/vanilla_forum/library/core/class.session.php:318] Gdn_Auth->GetUserModel();
[/home/willwh5/public_html/dragonpulls/vanilla_forum/library/core/class.auth.php:41] Gdn_Session->Start();
[/home/willwh5/public_html/dragonpulls/vanilla_forum/bootstrap.php:214] Gdn_Auth->StartAuthenticator();
[/home/willwh5/public_html/dragonpulls/vanilla_forum/index.php:33] PHP::require_once();

Variables in local scope:

[ClassName] 'UserModel'
[Options] array (
  'Quiet' => false,
  'RespectPriorities' => true,
)
[MapType] 'library'
[DefaultOptions] array (
  'Quiet' => false,
  'RespectPriorities' => true,
)
[File] '/home/willwh5/public_html/dragonpulls/vanilla_forum/applications/dashboard/models/class.usermodel.php'

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