管理画面からのリンクが全てNot Foundになる

始めまして、baserCMSを使ってあるサイトを運営していたのですが
先日管理画面にログインしたところ、管理画面からの管理機能リンクが
全てNot Foundになってしまいました。
修正方法をご存じの方の方がおられたら、ご教授いただけませんでしょうか?

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■リンク先にて表示されるエラーメッセージ

Not Found
エラー: The request sent to the address '/admin/dashboard/admin/pages/index' was invalid.
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■debug.logに記載されていたメッセージ

2018-07-15 11:02:36 Notice: Notice (8): Undefined variable: url in [/home/*****/www/*****/lib/Baser/View/Helper/BcBaserHelper.php, line 1491]
Trace:
BcBaserHelper::getUri() - CORE/Baser/View/Helper/BcBaserHelper.php, line 1491
include - APP/webroot/theme/*****/Pages/index.php, line 29
View::_evaluate() - CORE/Cake/View/View.php, line 954
BcAppView::evaluate() - CORE/Baser/View/BcAppView.php, line 438
BcPageHelper::content() - CORE/Baser/View/Helper/BcPageHelper.php, line 433
include - CORE/Baser/View/Pages/templates/default.php, line 17
View::_evaluate() - CORE/Cake/View/View.php, line 954
View::_render() - CORE/Cake/View/View.php, line 916
View::render() - CORE/Cake/View/View.php, line 473
Controller::render() - CORE/Cake/Controller/Controller.php, line 959
PagesController::display() - CORE/Baser/Controller/PagesController.php, line 666
ReflectionMethod::invokeArgs() - [internal], line ??
Controller::invokeAction() - CORE/Cake/Controller/Controller.php, line 490
Dispatcher::_invoke() - CORE/Cake/Routing/Dispatcher.php, line 193
Dispatcher::dispatch() - CORE/Cake/Routing/Dispatcher.php, line 167
[main] - APP/webroot/index.php, line 151

2018-07-15 11:02:36 Notice: Notice (8): Undefined variable: url in [/home/*****/www/*****/lib/Baser/View/Helper/BcBaserHelper.php, line 1483]
Trace:
BcBaserHelper::getUri() - CORE/Baser/View/Helper/BcBaserHelper.php, line 1483
include - APP/webroot/theme/*****/Pages/index.php, line 30
View::_evaluate() - CORE/Cake/View/View.php, line 954
BcAppView::evaluate() - CORE/Baser/View/BcAppView.php, line 438
BcPageHelper::content() - CORE/Baser/View/Helper/BcPageHelper.php, line 433
include - CORE/Baser/View/Pages/templates/default.php, line 17
View::_evaluate() - CORE/Cake/View/View.php, line 954
View::_render() - CORE/Cake/View/View.php, line 916
View::render() - CORE/Cake/View/View.php, line 473
Controller::render() - CORE/Cake/Controller/Controller.php, line 959
PagesController::display() - CORE/Baser/Controller/PagesController.php, line 666
ReflectionMethod::invokeArgs() - [internal], line ??
Controller::invokeAction() - CORE/Cake/Controller/Controller.php, line 490
Dispatcher::_invoke() - CORE/Cake/Routing/Dispatcher.php, line 193
Dispatcher::dispatch() - CORE/Cake/Routing/Dispatcher.php, line 167
[main] - APP/webroot/index.php, line 151
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■error.logに記載されていたメッセージ
2018-07-16 21:58:49 Warning: Warning (2): Missing argument 1 for BcBaserHelper::getUri(), called in /home/*****/www/*****/app/webroot/theme/*****/Pages/index.php on line

15 and defined in [/home/*****/www/*****/lib/Baser/View/Helper/BcBaserHelper.php, line 1482]
Trace:
BcBaserHelper::getUri() - CORE/Baser/View/Helper/BcBaserHelper.php, line 1482
include - APP/webroot/theme/*****/Pages/index.php, line 15
View::_evaluate() - CORE/Cake/View/View.php, line 954
BcAppView::evaluate() - CORE/Baser/View/BcAppView.php, line 438
BcPageHelper::content() - CORE/Baser/View/Helper/BcPageHelper.php, line 433
include - CORE/Baser/View/Pages/templates/default.php, line 17
View::_evaluate() - CORE/Cake/View/View.php, line 954
View::_render() - CORE/Cake/View/View.php, line 916
View::render() - CORE/Cake/View/View.php, line 473
Controller::render() - CORE/Cake/Controller/Controller.php, line 959
PagesController::display() - CORE/Baser/Controller/PagesController.php, line 666
ReflectionMethod::invokeArgs() - [internal], line ??
Controller::invokeAction() - CORE/Cake/Controller/Controller.php, line 490
Dispatcher::_invoke() - CORE/Cake/Routing/Dispatcher.php, line 193
Dispatcher::dispatch() - CORE/Cake/Routing/Dispatcher.php, line 167
[main] - APP/webroot/index.php, line 151
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■使用サーバー：さくらインターネット
■PHPバージョン：PHP 5.6.36 (CGI版)
■データベース バージョン: MySQL 5.5
■BacerCMSバージョン：不明

お手数おかけしますが、何卒ご協力の程、よろしくお願い致します。