Admin page cannot be found after domain name change

hi guys i need urgent help

i have changed the domain name of my store and have changed the main config file and admin config file to match this.

The store functions properly however i cannot access admin side i get the following error

The blind4less.co.uk page isn’t working

blind4less.co.uk is currently unable to handle this request.
500


main config file
admin config file

please help

thank you much appreciated

maybe something in a .htaccess that you forgot about?

Thank you for your response

i doubt it i have tried changing the htaccess to default opencart still no luck

my htaccess file


default file thank you