HTTP 500 error after deleting categories from archive.php via child theme

Hello,
thank you for the great Boldial theme:) Im quite new to WP and for the 1st time I have problem with internal server error http 500. It happened after I was trying to remove categories. I was reading this post https://bit.ly/1yqjn2y and followed your instructions, i copied archive.php from parent to a child theme and then it happened – error 500. Since than Im unable to do anything, I cant even log in to WP. User pastthewire (in the mentioned topic) seemed to have the same problem (“I installed the child theme. I think I screwed something up though… I copied the “archive.php” file into the child themes “functions.php”, after I did that my site went blank and I am unable to load anything, can’t even get into my wordpress dashboard”)

Unfortuatelly I stil have it on local sever, so I cant give you access. Can you help me, pls? Today I wanted to upload my webpage to hosting and this happened.

Thank you and take care!