wp-admin white page

Hi;
How are you? This is luis.

I have a problem on wp-admin. I have been working in localhost, I migrated to production server. Everything is allright, i can see all the pages, the database is working allright but…

when I try to wp-admin it goes White page. in the debug the problem is the following:

Warning: Cannot modify header information – headers already sent by (output started at /home/bpbwnasl/public_html/wp-config.php:1) in /home/bpbwnasl/public_html/wp-includes/pluggable.php on line 875

I have review the wp-config and seems to be ok,

in the pluggable.php on line 875 the following code shows up:

header(“Location: $location”, true, $status);

I was using customizr theme, but I don’t know what the hell is going on…

i am just a beginner…
if anyone could give me a hand i would be very happy

sorry, if i make a mistake…i

thanks