I can't log in dashboard after login, wp_get_theme

Thanks – so that’s a problem with your theme – so you’ll need to deactivate the theme by using FTP to access your site files – changing the name on the theme’s folder will force WP to use the default theme and let you login again. You can find the theme’s folder here:

wp-content
     themes
         pure-lineHOLD (change this name)

IF you don’t have FTP set up, ask your hosting company for help with that.

Thank you! Can you show me how to set up FTP?

Looks like your site is on HostGator? If so, this should be helpful:

https://support.hostgator.com/articles/ftp-getting-started