I have manage to install ghost, but I am getting this page in browser.
500
## The currently active theme "casper" is invalid.
[Go to the front page →](https://domain.tld/)
### Theme errors
Systemd error:
at trim_prefix (/var/www/ghost/node_modules/express/lib/router/index.js:315:13)
at /var/www/ghost/node_modules/express/lib/router/index.js:284:7
at Function.process_params (/var/www/ghost/node_modules/express/lib/router/index.js:335:12)
at next (/var/www/ghost/node_modules/express/lib/router/index.js:275:10)
at Layer.handle_error (/var/www/ghost/node_modules/express/lib/router/layer.js:67:12)
at trim_prefix (/var/www/ghost/node_modules/express/lib/router/index.js:315:13)
at /var/www/ghost/node_modules/express/lib/router/index.js:284:7
at Function.process_params (/var/www/ghost/node_modules/express/lib/router/index.js:335:12)
Error: ENOENT: no such file or directory, open '/var/www/ghost/core/server/public/ghost.min.css'