Scripts not loading

I’m trying to discover what I changed so that my scripts are no longer loading.

All jquery/plugin scripts are absent when viewing source and I’m getting 3 ‘ReferenceError: $ is not defined’ messages.

Yesterday I used a custom function to move scripts from header to footer, then removed that function because some scripts wouldn’t then work.

Maybe I’m not seeing a typo somewhere?

I’ll continue working-through this to find the cause, and meantime post this in the hope that someone has ideas.

UPDATE: 1-minute later…

Removing <?php if ( is_singular() ) wp_enqueue_script( ‘comment-reply’ ); wp_head(); ?> was the issue.

I don’t use comments and so removed the whole tag.

With <?php wp_head(); ?> now restored, all ok.