"function 's.t.r.r.e.v' not found or invalid function name" error during login

Hi,
I just updated my WP Residence theme in wordpress and when i tried to log in again into admin dashboard the below mentioned errors popped out and said incoorect username and password. Although when i go to my main site it shows that i have logged in and if i try to access dashboard from there it works but log in directly from wp admin not working.

Warning: call_user_func() expects parameter 1 to be a valid callback, function ‘s.t.r.r.e.v’ not found or invalid function name in /home/naren1980/public_html/wp-content/themes/wpresidence/libs/searchfunctions.php on line 1069

Warning: call_user_func() expects parameter 1 to be a valid callback, function ‘s.t.r.r.e.v’ not found or invalid function name in /home/naren1980/public_html/wp-content/themes/wpresidence/libs/searchfunctions.php on line 1074

Warning: call_user_func() expects parameter 1 to be a valid callback, no array or string given in /home/naren1980/public_html/wp-content/themes/wpresidence/libs/searchfunctions.php on line 1075

Warning: call_user_func() expects parameter 1 to be a valid callback, function ‘s.t.r.r.e.v’ not found or invalid function name in /home/naren1980/public_html/wp-content/themes/wpresidence/libs/searchfunctions.php on line 1076

Warning: Cannot modify header information – headers already sent by (output started at /home/naren1980/public_html/wp-content/themes/wpresidence/libs/searchfunctions.php:1068) in /home/naren1980/public_html/wp-content/themes/wpresidence/libs/searchfunctions.php on line 1077

What should i do to make this go away/