Cant login to backoffice after upgrade from 1.7.8 to 8.1 version

[lsykora]

Hello everyone,

 

I did 1 click upgrade from my prestashop 1.7.8 in to 8.1.. In front end, everything looks fine. But the problem is, I cant login in to backoffice. When I go to my backoffice : http://localhost/eshop123/spravce/ I get in here. I fill up the login details and when I press login I get error:

Attempted to call an undefined method named "jsonDecode" of class "Tools".

[Symfony\Component\ErrorHandler\Error\UndefinedMethodError 0]

Im running on php version 7.4. so it should not be a problem. My guess is, that there is some kind of module, that no longer works on 8.1. If any1 could confirm that, I can try to delete modules 1 by 1 and find out which one causes this problem. (Also would be nice if any1 can confirm, that delete modules I can just do like "/modules/ and here delete modules one by one") or is there any other way?

 

Of course if any1 know how to fix the error it would be the best!

 

Thanks for help

[lsykora]

Fixed, it was because of module hiaddtocartbutton

[markoo]

I have the same problem, 

 

you just dlete the hiaddtocartbutton folder from modules and work?

 

[AddWeb Solution]

20 hours ago, markoo said:

you just dlete the hiaddtocartbutton folder from modules and work?

 

Hi,

Recommended way to uninstall a module

1. Log in to your Prestashop admin dashboard.

2. Go to "Modules" and then click on "Module Manager"

3. Locate the module you want to uninstall in the list.

4. If the module is currently enabled, click on the "Disable" button. This will deactivate the module.

5. After disabling the module, you'll see an "Uninstall" button. Click on it to uninstall the module. This step will remove the module from your Prestashop installation.

6. After uninstalling the module, it's a good practice to clear the Prestashop cache

Thanks!

[lsykora]

21 hours ago, markoo said:

I have the same problem, 

 

you just dlete the hiaddtocartbutton folder from modules and work?

 

Hello yes I did just deleted the folder. Anyway before you delete it, make sure you have backup.

[Yenibosnaweb]

I have the same problem. I did 1 click upgrade from my prestashop 1.7.5.1 in to 8.1., everything looks fine in front side. But I still can't login in to backoffice.
Does anyone help me how to fix that problem. I have tried almost everything in prestashop forum

 

Edited January 16 by Yenibosnaweb (see edit history)

[Yenibosnaweb]

Here is the error code in admin panel

PHP Fatal error:  Uncaught Symfony\Component\ErrorHandler\Error\UndefinedFunctionError: Attempted to call function "get_cfg_var" from namespace "Symfony\Component\ErrorHandler\ErrorRenderer". in /home/tlemse/public_html/vendor/symfony/symfony/src/Symfony/Component/ErrorHandler/ErrorRenderer/HtmlErrorRenderer.php:60
Stack trace:
#0 /home/tlemse/public_html/vendor/symfony/symfony/src/Symfony/Component/ErrorHandler/ErrorHandler.php(711): Symfony\Component\ErrorHandler\ErrorRenderer\HtmlErrorRenderer->__construct(true)
#1 /home/tlemse/public_html/vendor/symfony/symfony/src/Symfony/Component/ErrorHandler/ErrorHandler.php(601): Symfony\Component\ErrorHandler\ErrorHandler->renderException(Object(Symfony\Component\ErrorHandler\Error\UndefinedFunctionError))
#2 [internal function]: Symfony\Component\ErrorHandler\ErrorHandler->handleException(Object(Symfony\Component\ErrorHandler\Error\UndefinedFunctionError))
#3 {main}
  thrown in /home/tlemse/public_html/vendor/symfony/symfony/src/Symfony/Component/ErrorHandler/ErrorRenderer/HtmlErrorRenderer.php on line 60

[Yenibosnaweb]

I NEED URGENT HELP PLEASE. does  anyone knows?