LSE</span>)</div><div class='output co'>#&gt; <span class='error'>Error in check_user_id(user_id): object 'bieber_user_id' not found</span></div><div class='input'><span class='no'>most_recent_post_comments</span> <span class='kw'>&lt;-</span> <span class='fu'>ig_get_media_comments</span>(<span class='kw'>media_id</span> <span class='kw'>=</span> <span class='no'>bieber_feed</span>$<span class='no'>id</span>[<span class='fl'>1</span>])</div><div class='output co'>#&gt; <span class='error'>Error in sprintf("