I downloaded concrete 5.7 and i wanted to change the theme from the default (elemental) theme to greek_yogurt or something else.
Because it isn't in the default install, i copied it from core concrete/themes folder and pasted it in application/themes folder.
Then i go to the themes into the website and install the theme greek_yogurt.
When i installed it, i click on activate,
Then i go and see how the theme looks. But then i get a error:
An unexpected error occurred.
An error occurred while processing this request.
What can I do to fix this, or what am i doing wrong?