Theme problem, 500 Internal Server Error

So, i install a new wordpress for my site, Euphoria, from https://rockablethemes.com.

I’m trying to install Euphoria 2.0, activate the theme I get a 500 Internal Server Error. Then, if I try to log into wp-admin, the same error persists. I made all the necessary changes in the custom folder (names and permissions).

When I delete the Euphoria folder from wp-content/themes the error disappear and I can activate any other theme or log into my wp-admin without problems.

Hope you can help me.