Error Call to a member function getStyleValueList() on null

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Hello everyone. this is my first post. I am having this problem on the login page
Null a member function getStyleValueList ()
apparently could be a problem with the supermint theme ..
Any idea how to try to solve it.? I clarify that I have no programming knowledge Thank you all

the version of concrete is

Version 8.5.2
Installed Version 8.5.2

The website link is:http://www.goldenride.com.ar/index.php/login
thanks

 
JohntheFish replied on at Permalink Reply
JohntheFish
Supermint is unsupported and not compatible with the latest versions of concrete5. Unless you are aiming to learn about programming, you should look for a different theme that is maintained and compatible with v8.5.2+.
lookwells replied on at Permalink Reply
Thanks for the reply. Do you know how it could be done to change the theme for another one? if I don't have access to the dashboard? Thank you