wp125 error

After changing w3cache per hostgators instructions I’m getting this error on my wp125 ads – and yes, I’ve confirmed that all links, to both images and target pages are correct…

Warning: Cannot modify header information – headers already sent by (output started at /home/annewaym/public_html/aboutfreelancewriting/index.php:2) in /home/annewaym/public_html/aboutfreelancewriting/wp-content/plugins/wp125/wp125.php on line 26

Just so you know I’ve deleted the plugin, downloaded and reinstalled it. Made no difference.

Any thoughts? Help?

Thanks so much.