wp_enqueue_script not working, no idea why

Hi, I have a problem with running some javascript, and as far as I can tell, all my code is completely okay. Here’s the code in my functions.php file:

<?php
function ColTheme_enqueue_scripts(){
echo "Testing";
wp_enqueue_script('scrippyj', get_bloginfo('template_directory') . '/scrippyj.js');
}
add_action('init', 'ColTheme_enqueue_scripts');
?>

The “Testing” text prints successfully on my site, but the scrippyj.js file does not run. I’ve tried using get_template_directory_uri() instead of get_bloginfo, but that didn’t change anything. I even looked at the website’s source code, and there is nothing mentioned about enqueueing scripts.

Also, possibly related, now when I try to go to my WordPress dashboard, I get an error:
“Warning: Cannot modify header information – headers already sent by (output started at /home4/cbrummette/public_html/wp-content/themes/ColTheme/functions.php:2) in /home4/cbrummette/public_html/wp-includes/pluggable.php on line 1167”

Does someone know what’s going on? Thanks in advance