Warning: Cannot modify header information – headers already sent by

I am getting this warning and my website is totally broken it doesn’t let me enter to admin site. This is the text. Please check: https://www.beadkreative.com

Cannot modify header information – headers already sent by (output started at /mounted-storage/home61b/sub002/sc38737-WIYB/beadkreative.com/wp-config.php:1) in /mounted-storage/home61b/sub002/sc38737-WIYB/beadkreative.com/wp-includes/pluggable.php on line 1173

This is what I have done the following based on the furums:
– Removed all the blank spaces from the wp-config.php file
– Removed the blank spaces from the class.wp-scripts.php
– Removed all the blank spaces from pluggable.php

Please HELP I don’t know what else to do!