Major multistore problem - cannot login to admin panel anymore

[Rehlein]

Hi all,

I am in major trouble. I just enabled the multistore option in my Prestashop 1.7.3.0 and added the 2nd shop. After this i went to the category page and changed the text for one category for the new shop to see how that works, and also to check if the text in the main shop stays unchanged. Now comes the problem: if I try to log in to the admin panel, I can't, instead I get redirected to the 404 page. I have no idea how to fix this as I cannot login to the admin. Does anyone have an idea?

Thanks for your help!