Error message on my installation

it means that functions.php of your currently used the is broken.

try to use FTP http://codex.ww.wp.xz.cn/FTP_Clients to rename the folder of your theme from /lawbusiness/ to something else;
this should activate the default theme Twenty Fifteen and allow you back into the dashboard where you can then repair or replace the code of functions.php of the theme; https://codex.ww.wp.xz.cn/Editing_Files