having trouble logging in

hi. i’m at fashiondilettante.com/dev and cannot seem to login anymore from the https://fashiondilettante.com/dev/wp-admin site? this literally worked this morning. when i’m at https://fashiondilettante.com/dev/wp-admin it is just a blank screen. can still though log into original site at fashiondilettante.com. any ideas?

https://www.ads-software.com/extend/plugins/duplicator/