Fatal error: Class 'Concrete5_Model_UserAttributeKey' after log in

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Hi, can anyone help me with the following error? After trying to log in to the website I get the following error:

Fatal error: Class 'Concrete5_Model_UserAttributeKey' not found in /var/www/vhosts/domainname.com/httpdocs/concrete/models/attribute/categories/user.php on line 4

Anyone?

Thanks,
Luca

ZillionProductions
 
ronyDdeveloper replied on at Permalink Reply
ronyDdeveloper
Have you moved your site from somewhere else? Like localhost or any other server. If so, just make it sure that you have uploaded all the files properly.
ZillionProductions replied on at Permalink Reply
ZillionProductions
Hi Rony! The server (of our customer) was hacked so they had to reinstall the server and upload the files again. Unfortunately they can't be more precise about their actions...
ronyDdeveloper replied on at Permalink Best Answer Reply
ronyDdeveloper
Well you can do one thing. Just download the Concrete5 from the site and upload the "concrete" folder only. But before that, rename the sites concrete folder to "concrete_OLD" or something like that.

Note: Make it sure that you have downloaded the same version as the current one.

Rony
ZillionProductions replied on at Permalink Reply
ZillionProductions
Hi Rony! Thanks, this solved the problem and safed a lot of time!

Have a great day,
Luca
ronyDdeveloper replied on at Permalink Reply
ronyDdeveloper
Please mark it as best answer so others will get help from this post.

Rony