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Im going through a tutorial online that would allow users to post status to their wall and to their friends but im getting the error :

Warning: mysqli_query(): Couldn't fetch mysqli in /storage/h7/475/1137475/public_html/template_status.php on line 15

It is storing to the db but its not displaying on the user profile.

Here is the template_status.php code:
Can someone pls help?

<?php

$status_ui = "";
$statuslist = "";
if($isOwner == "yes"){
    $status_ui = '<textarea id="statustext" onkeyup="statusMax(this,250)" placeholder="What&#39;s new with you '.$u.'?"></textarea>';
    $status_ui .= '<button id="statusBtn" onclick="postToStatus(\'status_post\',\'a\',\''.$u.'\',\'statustext\')">Post</button>';
} else if($isFriend == true && $log_username != $u){
    $status_ui = '<textarea id="statustext" onkeyup="statusMax(this,250)" placeholder="Hi '.$log_username.', say something to '.$u.'"></textarea>';
    $status_ui .= '<button id="statusBtn" onclick="postToStatus(\'status_post\',\'c\',\''.$u.'\',\'statustext\')">Post</button>';
}
?>
<?php 
$sql = "SELECT * FROM status WHERE account_name='$u' AND type='a' OR account_name='$u' AND type='c' ORDER BY postdate DESC LIMIT 20";
$query = mysqli_query($db_conx, $sql);
var_dump($query);   
$statusnumrows = mysqli_num_rows($query);

while ($row = mysqli_fetch_array($query, MYSQLI_ASSOC)) {
    $statusid = $row["id"];
    $account_name = $row["account_name"];
    $author = $row["author"];
    $postdate = $row["postdate"];
    $data = $row["data"];
    $data = nl2br($data);
    $data = str_replace("&amp;","&",$data);
    $data = stripslashes($data);
    $statusDeleteButton = '';
    if($author == $log_username || $account_name == $log_username ){
        $statusDeleteButton = '<span id="sdb_'.$statusid.'"><a href="#" onclick="return false;" onmousedown="deleteStatus(\''.$statusid.'\',\'status_'.$statusid.'\');" title="DELETE THIS STATUS AND ITS REPLIES">delete status</a></span> &nbsp; &nbsp;';
    }
    // GATHER UP ANY STATUS REPLIES
    $status_replies = "";
    $query_replies = mysqli_query($db_conx, "SELECT * FROM status WHERE osid='$statusid' AND type='b' ORDER BY postdate ASC");
    $replynumrows = mysqli_num_rows($query_replies);
    if($replynumrows > 0){
        while ($row2 = mysqli_fetch_array($query_replies, MYSQLI_ASSOC)) {
            $statusreplyid = $row2["id"];
            $replyauthor = $row2["author"];
            $replydata = $row2["data"];
            $replydata = nl2br($replydata);
            $replypostdate = $row2["postdate"];
            $replydata = str_replace("&amp;","&",$replydata);
            $replydata = stripslashes($replydata);
            $replyDeleteButton = '';
            if($replyauthor == $log_username || $account_name == $log_username ){
                $replyDeleteButton = '<span id="srdb_'.$statusreplyid.'"><a href="#" onclick="return false;" onmousedown="deleteReply(\''.$statusreplyid.'\',\'reply_'.$statusreplyid.'\');" title="DELETE THIS COMMENT">remove</a></span>';
            }
            $status_replies .= '<div id="reply_'.$statusreplyid.'" class="reply_boxes"><div><b>Reply by <a href="user.php?u='.$replyauthor.'">'.$replyauthor.'</a> '.$replypostdate.':</b> '.$replyDeleteButton.'<br />'.$replydata.'</div></div>';
        }
    }
    $statuslist .= '<div id="status_'.$statusid.'" class="status_boxes"><div><b>Posted by <a href="user.php?u='.$author.'">'.$author.'</a> '.$postdate.':</b> '.$statusDeleteButton.' <br />'.$data.'</div>'.$status_replies.'</div>';
    if($isFriend == true || $log_username == $u){
        $statuslist .= '<textarea id="replytext_'.$statusid.'" class="replytext" onkeyup="statusMax(this,250)" placeholder="write a comment here"></textarea><button id="replyBtn_'.$statusid.'" onclick="replyToStatus('.$statusid.',\''.$u.'\',\'replytext_'.$statusid.'\',this)">Reply</button>';    
    }
}
?>

<script type="text/javascript">
function postToStatus(action,type,user,ta){
    var data = _(ta).value;
    if(data == ""){
        alert("Type something first weenis");
        return false;
    }
    _("statusBtn").disabled = true;
    var ajax = ajaxObj("POST", "php_parsers/status_system.php");
    ajax.onreadystatechange = function() {
        if(ajaxReturn(ajax) == true) {
            var datArray = ajax.responseText.split("|");
            if(datArray[0] == "post_ok"){
                var sid = datArray[1];
                data = data.replace(/</g,"&lt;").replace(/>/g,"&gt;").replace(/\n/g,"<br />").replace(/\r/g,"<br />");
                var currentHTML = _("statusarea").innerHTML;
                _("statusarea").innerHTML = '<div id="status_'+sid+'" class="status_boxes"><div><b>Posted by you just now:</b> <span id="sdb_'+sid+'"><a href="#" onclick="return false;" onmousedown="deleteStatus(\''+sid+'\',\'status_'+sid+'\');" title="DELETE THIS STATUS AND ITS REPLIES">delete status</a></span><br />'+data+'</div></div><textarea id="replytext_'+sid+'" class="replytext" onkeyup="statusMax(this,250)" placeholder="write a comment here"></textarea><button id="replyBtn_'+sid+'" onclick="replyToStatus('+sid+',\'<?php echo $u; ?>\',\'replytext_'+sid+'\',this)">Reply</button>'+currentHTML;
                _("statusBtn").disabled = false;
                _(ta).value = "";
            } else {
                alert(ajax.responseText);
            }
        }
    }
    ajax.send("action="+action+"&type="+type+"&user="+user+"&data="+data);
}
function replyToStatus(sid,user,ta,btn){
    var data = _(ta).value;
    if(data == ""){
        alert("Type something first weenis");
        return false;
    }
    _("replyBtn_"+sid).disabled = true;
    var ajax = ajaxObj("POST", "php_parsers/status_system.php");
    ajax.onreadystatechange = function() {
        if(ajaxReturn(ajax) == true) {
            var datArray = ajax.responseText.split("|");
            if(datArray[0] == "reply_ok"){
                var rid = datArray[1];
                data = data.replace(/</g,"&lt;").replace(/>/g,"&gt;").replace(/\n/g,"<br />").replace(/\r/g,"<br />");
                _("status_"+sid).innerHTML += '<div id="reply_'+rid+'" class="reply_boxes"><div><b>Reply by you just now:</b><span id="srdb_'+rid+'"><a href="#" onclick="return false;" onmousedown="deleteReply(\''+rid+'\',\'reply_'+rid+'\');" title="DELETE THIS COMMENT">remove</a></span><br />'+data+'</div></div>';
                _("replyBtn_"+sid).disabled = false;
                _(ta).value = "";
            } else {
                alert(ajax.responseText);
            }
        }
    }
    ajax.send("action=status_reply&sid="+sid+"&user="+user+"&data="+data);
}
function deleteStatus(statusid,statusbox){
    var conf = confirm("Press OK to confirm deletion of this status and its replies");
    if(conf != true){
        return false;
    }
    var ajax = ajaxObj("POST", "php_parsers/status_system.php");
    ajax.onreadystatechange = function() {
        if(ajaxReturn(ajax) == true) {
            if(ajax.responseText == "delete_ok"){
                _(statusbox).style.display = 'none';
                _("replytext_"+statusid).style.display = 'none';
                _("replyBtn_"+statusid).style.display = 'none';
            } else {
                alert(ajax.responseText);
            }
        }
    }
    ajax.send("action=delete_status&statusid="+statusid);
}
function deleteReply(replyid,replybox){
    var conf = confirm("Press OK to confirm deletion of this reply");
    if(conf != true){
        return false;
    }
    var ajax = ajaxObj("POST", "php_parsers/status_system.php");
    ajax.onreadystatechange = function() {
        if(ajaxReturn(ajax) == true) {
            if(ajax.responseText == "delete_ok"){
                _(replybox).style.display = 'none';
            } else {
                alert(ajax.responseText);
            }
        }
    }
    ajax.send("action=delete_reply&replyid="+replyid);
}
function statusMax(field, maxlimit) {
    if (field.value.length > maxlimit){
        alert(maxlimit+" maximum character limit reached");
        field.value = field.value.substring(0, maxlimit);
    }
}
</script>
<div id="statusui">
  <?php echo $status_ui; ?>
</div>
<div id="statusarea">
  <?php echo $statuslist; ?>
</div>
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