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My shop is live : shop.sheepdog-training.co.uk    but I cannot access the back office/admin panel to make changes. After switching to debug mode, when I try to access the BO the page returns the following:

Notice: Undefined index: adminnotfound in /homepages/9/d461631471/htdocs/clickandbuilds/PrestaShop/shop/classes/Dispatcher.php on line 335

Fatal error: Uncaught Error: Class name must be a valid object or a string in /homepages/9/d461631471/htdocs/clickandbuilds/PrestaShop/shop/classes/controller/Controller.php:134 Stack trace: #0 /homepages/9/d461631471/htdocs/clickandbuilds/PrestaShop/shop/classes/Dispatcher.php(359): ControllerCore::getController(NULL) #1 /homepages/9/d461631471/htdocs/clickandbuilds/PrestaShop/shop/backoffice/index.php(58): DispatcherCore->dispatch() #2 {main} thrown in /homepages/9/d461631471/htdocs/clickandbuilds/PrestaShop/shop/classes/controller/Controller.php on line 134

Any help would be greatly appreciated. 

My shop is live : shop.sheepdog-training.co.uk    but I cannot access the back office/admin panel to make changes. When I try to access the BO the page returns the following:

This page isn’t working

shop.sheepdog-training.co.uk is currently unable to handle this request.

Any help would be greatly appreciated. 

My shop is live : shop.sheepdog-training.co.uk    but I cannot access the back office/admin panel to make changes. When I try to access the BO the page returns the following:

This page isn’t working

shop.sheepdog-training.co.uk is currently unable to handle this request.

'This page isn't working' error when I try to access the BO. Any help would be greatly appreciated. 

My shop is live : shop.sheepdog-training.co.uk    but I cannot access the back office/admin panel to make changes. The page returns a 'This page isn't working' error when I try to access the BO. Any help would be greatly appreciated. 

My shop is live : shop.sheepdog-training.co.uk    but I cannot access the back office/admin panel to make changes. The page returns an error when I try to access the BO. Any help would be greatly appreciated. 

My shop is live : shop.sheepdog-training.co.uk    but I cannot access the back office/admin panel to make changes. The page returns an error when I try to access the BO. Any help would be greatly appreciated. 

My shop is live : shop.sheepdog-training.co.uk    but I cannot access the back panel/admin panel to make changes. I haven't used this for a few weeks so no changes have been made. All the ftp files are intact. 

My login link is bookmarked as:http://shop.sheepdog-training.co.uk/backoffice/index.php?controller=AdminLogin&token=36839d1ce4de3213a4d480ee117e1332&redirect=AdminCarriers

I have tried this on my phone and also Chrome.  Any help would be greatly appreciated. Can anyone please suggest the login url please as mine might have become corrupt. Is it http://shop.sheepdog-training.co.uk/backoffice/index.php?