/admin-page - ERR_TOO_MANY_REDIRECTS

[philikran]

I like the simple structure used to run the cms. thanks for that!
my problem: I installed the cms on a local apache in a subfolder. the frontend also works without any problems. But I can't log in to the admin dashboard. I'm always redirected to http://localhost/subfolder/admin/login and get an error in the browser 'ERR_TOO_MANY_REDIRECTS'. Unfortunately, an entry in the .htaccess file with RewriteBase /subfolder was of no use. Any ideas? Unfortunately, my PHP skills are a little rusty, so I can't solve the problem myself quickly.
Thanks.