Massive errors when gallery settings changed

I went into gallery settings to change size limitations/allowances on the multiple images this plugin creates when a single image is uploaded. After doing so, I could not
– edit (got 404 Not Found error)
– upload additional images (got 404 Not Found error)
– see any thumbnails in Media Library, just blank squares
– go to any other menu item (got 404 Not Found error)

Went to 2 different browsers to see if this was browser related, but could not even log onto my website through wp-admin (got 404 Not Found error).

Tried to view my site on 3 different browsers (got 404 Not Found error).

Finally had to login to hosting site, and delete this plugin from wp-content > plugins. No further (404 Not Found) errors after plugin deleted.

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