LOGIN ERROR : URL -htpp://najmitravels.com/wp-login.php

I AM UNABLE TO LOGIN WITH MY USERID AND PASSWORD FOR MY SITE
URL -htpp://najmitravels.com/wp-login.php

ERROR MSG
There has been critical error on this website.please check your site admin email box for instructions

not recd any email yet
please help me to restore my site
thanks and regards
Moiyed