wp-admin NOT showing

After installing WP Robots Txt, I noticed that once I pressed “Update” after any changes on the 2 websites I installed it in, I would get a blank page and I’d have to return to those pages manually through the URL.

Now it got worse, I can’t access the backend of any of the sites I installed it in. If I type example.com/wp-admin, I get a blank page.

I believe I left the User-agent:* Disallow:/wp-admin/ and Disallow /wp-includes/ on the file.

Could that have caused it? Regardless… How do I go back to what I had before? I already ftp’d into the server and deleted the plugin files manually but I still get a blank page.

How can I fix this?

Thanks!

https://www.ads-software.com/plugins/wp-robots-txt/