HELP!!! Error on login page!?

Hi there,

I have recently had to change from hosting company on one of my websites. I had help doing it from a friend who designed my website, as I have little knowledge on how to do these things. After my website was moved to this other hosting company, I wasn’t able to log into my dashboard anymore. I’d go to my login page, put in my username and password and the following wold be displayed : Warning: Cannot modify header information – headers already sent by (output started at /home/content/39/8515139/html/wp-content/plugins/SFBS-Advertising/index.php:180) in /home/content/39/8515139/html/wp-login.php on line 353 …the same message would be displayed 6 times over. At first I thought it had something to do with my cookie settings on my browser, but I enabled them and it made no difference.

I’m in desperate need of help, can you please assist me on this??

Kind regards