<html>
<head>
<title>{$thread['subject']}</title>
{$headerinclude}
<script type="text/javascript">
<!--
var quickdelete_confirm = "{$lang->quickdelete_confirm}";
var quickrestore_confirm = "{$lang->quickrestore_confirm}";
var allowEditReason = "{$mybb->settings['alloweditreason']}";
lang.save_changes = "{$lang->save_changes}";
lang.cancel_edit = "{$lang->cancel_edit}";
lang.quick_edit_update_error = "{$lang->quick_edit_update_error}";
lang.quick_reply_post_error = "{$lang->quick_reply_post_error}";
lang.quick_delete_error = "{$lang->quick_delete_error}";
lang.quick_delete_success = "{$lang->quick_delete_success}";
lang.quick_delete_thread_success = "{$lang->quick_delete_thread_success}";
lang.quick_restore_error = "{$lang->quick_restore_error}";
lang.quick_restore_success = "{$lang->quick_restore_success}";
lang.editreason = "{$lang->postbit_editreason}";
lang.post_deleted_error = "{$lang->post_deleted_error}";
lang.softdelete_thread = "{$lang->soft_delete_thread}";
lang.restore_thread = "{$lang->restore_thread}";
// -->
</script>
<!-- jeditable (jquery) -->
<script type="text/javascript" src="{$mybb->asset_url}/jscripts/report.js?ver=1820"></script>
<script src="{$mybb->asset_url}/jscripts/jeditable/jeditable.min.js"></script>
<script type="text/javascript" src="{$mybb->asset_url}/jscripts/thread.js?ver=1822"></script>
</head>
<body>
{$header}
{$threadnotesbox}
{$pollbox}
<div class="float_left">
{$multipage}
</div>
<div class="float_right">
{$newreply}
</div>
<table border="0" cellspacing="0" cellpadding="0" width="100%">
<tr>
<td class="thead"align="left"><strong>Subject İnformation <i class="float_right fas fa-gavel fa-lg"></i></strong></td>
</tr>
</table>
<table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-left:1px solid #f5f6f7;border-right:1px solid #f5f6f7;text-align:center;">
<tr>
<td class="trow1" width="25%"align="left"><strong><i class="fas fa-users fa-lg"style="color:#3792B5;"></i> Author</strong></td>
<td class="trow1" width="25%">{$thread[username]}</td>
<td class="mobile-hide trow1" width="25%"align="left"><strong><i class=" fas fa-comments fa-lg"style="color:#4BB232;"></i> Replies</strong></td>
<td class="mobile-hide trow1" width="25%">{$thread['replies']}</td>
</tr>
<tr>
<td class="mobile-hide trow1" width="25%"align="left"><strong><i class="fas fa-share fa-lg"style="color:#E35798;"></i> Share</strong></td>
<td class="mobile-hide trow1" width="25%">
<a href="http://www.facebook.com/sharer.php?u={$mybb->settings['bburl']}/showthread.php?tid={$thread['tid']}" target=_blank><i class="fab fa-facebook" style="margin-left:15px;font-size:22px;"title="Facebook" align="center"></i></a>
<a href="http://twitter.com/home?status={$mybb->settings['bburl']}/showthread.php?tid={$thread['tid']}" target=_blank>
<i class="fab fa-twitter-square" title="Twitter" align="center"style="font-size:22px;"></i></a>
<a href="https://plus.google.com/share?url={$mybb->settings['bburl']}/showthread.php?tid={$thread['tid']}" rel="nofollow" target="_blank">
<i class="fab fa-google-plus-square"title="Google+" align="center"style="font-size:22px;"></i></a>
</td>
<td class="trow1" width="25%"align="left"><strong><i class="fas fa-eye fa-lg"style="color:#9B54E7;"></i> Views</strong></td>
<td class="trow1" width="25%">{$thread['views']}</td>
</tr>
<tr>
<table border="0" cellspacing="{$theme['borderwidth']}" cellpadding="{$theme['tablespace']}" class="tborder tfixed clear">
<tr>
<td class="thead">
<div class="float_right">
<span class="smalltext"><strong><a href="javascript:void(0)" id="thread_modes"><i class="fas fa-cog fa-lg"style="color:lightblue;padding-top: 2px;"></i></a>{$threadnoteslink}</strong></span>
</div>{$ratethread}
<div>
<strong>{$thread['threadprefix']}{$thread['subject']}</strong>
</div>
</td>
</tr>
<tr><td id="posts_container">
<div id="posts">
{$posts}
</div>
</td></tr>
<tr>
<td class="tfoot">
{$search_thread}
<div>
<strong><a href="{$next_oldest_link}"><i class="trow1 fas fa-arrow-circle-left"style=margin-top:3px;></i></a><a href="{$next_newest_link}"><i class="trow1 fas fa-arrow-circle-right"></i></a> </strong>
</div>
</td>
</tr>
</table>
<div class="float_left">
{$multipage}
</div>
<div style="padding-top: 4px;" class="float_right">
{$newreply}
</div>
<br class="clear" />
{$quickreply}
{$threadexbox}
{$similarthreads}
<br />
<div class="float_left">
<ul class="thread_tools">
{$printthread}
{$sendthread}
{$addremovesubscription}
{$addpoll}
</ul>
</div>
<div class="float_right" style="text-align: right;">
{$moderationoptions}
{$forumjump}
</div>
<br class="clear" />
{$usersbrowsing}
{$footer}
<div id="thread_modes_popup" class="popup_menu" style="display: none;"><div class="popup_item_container"><a href="showthread.php?mode=linear&tid={$tid}&pid={$pid}#pid{$pid}" class="popup_item">{$lang->linear}</a></div><div class="popup_item_container"><a href="showthread.php?mode=threaded&tid={$tid}&pid={$pid}#pid{$pid}" class="popup_item">{$lang->threaded}</a></div></div>
<script type="text/javascript">
// <!--
if(use_xmlhttprequest == "1")
{
$("#thread_modes").popupMenu();
}
// -->
</script>
<script type="text/javascript">
var thread_deleted = "{$thread_deleted}";
if(thread_deleted == "1")
{
$("#quick_reply_form, .new_reply_button, .thread_tools, .inline_rating").hide();
$("#moderator_options_selector option.option_mirage").attr("disabled","disabled");
}
</script>
</body>
</html>
I have found the error:
<td class="trow1" width="25%">{$thread[username]}</td>
Please change above line 49 to this:
<td class="trow1" width="25%">{$thread['username']}</td>
...missing the quotation marks.