Hi there!
Our forum was working ok (in fact, it works ok! but it has errors?), yesterday I realized the space was empty, very odd...
So, checked a few thing and saw a big errorlog file, full of error like the followings.... I have searched the line mentioned, and added below each error report...
Any idea? whats wrong?
[12-Dec-2017 00:12:48 America/Argentina/Cordoba] PHP Notice: Use of undefined constant WIRELESS - assumed 'WIRELESS' in /home/username/public_html/Sources/Subs.php on line 901
// Never show smileys for wireless clients. More bytes, can't see it anyway

.
if (WIRELESS)
$smileys = false;
elseif ($smileys !== null && ($smileys == '1' || $smileys == '0'))
$smileys = (bool) $smileys;
[12-Dec-2017 00:12:48 America/Argentina/Cordoba] PHP Notice: Undefined index: browser in /home/username/public_html/Sources/Subs.php on line 1118
'content' => '<div class="codeheader">' . $txt['code'] . ': <a href="javascript:void(0);" onclick="return smfSelectText(this);" class="codeoperation">' . $txt['code_select'] . '</a></div>' . ($context['browser']['is_gecko'] || $context['browser']['is_opera'] ? '<pre style="margin: 0; padding: 0;">' : '') . '<code class="bbc_code">$1</code>' . ($context['browser']['is_gecko'] || $context['browser']['is_opera'] ? '</pre>' : ''),
[12-Dec-2017 00:12:48 America/Argentina/Cordoba] PHP Notice: Undefined index: browser in /home/username/public_html/Sources/Subs.php on line 1160
'content' => '<div class="codeheader">' . $txt['code'] . ': ($2) <a href="#" onclick="return smfSelectText(this);" class="codeoperation">' . $txt['code_select'] . '</a></div>' . ($context['browser']['is_gecko'] || $context['browser']['is_opera'] ? '<pre style="margin: 0; padding: 0;">' : '') . '<code class="bbc_code">$1</code>' . ($context['browser']['is_gecko'] || $context['browser']['is_opera'] ? '</pre>' : ''),
[12-Dec-2017 00:12:48 America/Argentina/Cordoba] PHP Notice: Undefined index: browser in /home/username/public_html/Sources/Subs.php on line 1226
'content' => ($context['browser']['is_ie'] && !$context['browser']['is_mac_ie'] ? '<object classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000" width="$2" height="$3"><param name="movie" value="$1" /><param name="play" value="true" /><param name="loop" value="true" /><param name="quality" value="high" /><param name="AllowScriptAccess" value="never" /><embed src="$1" width="$2" height="$3" play="true" loop="true" quality="high" AllowScriptAccess="never" /><noembed><a href="$1" target="_blank" class="new_win">$1</a></noembed></object>' : '<embed type="application/x-shockwave-flash" src="$1" width="$2" height="$3" play="true" loop="true" quality="high" AllowScriptAccess="never" /><noembed><a href="$1" target="_blank" class="new_win">$1</a></noembed>'),
'validate' => create_function('&$tag, &$data, $disabled', '
[12-Dec-2017 00:12:48 America/Argentina/Cordoba] PHP Notice: Undefined index: browser in /home/username/public_html/Sources/Subs.php on line 1268
'before' => $context['browser']['is_ie'] ? '<table border="0" cellpadding="0" cellspacing="0" style="display: inline; vertical-align: middle; font: inherit;"><tr><td style="filter: Glow(color=$1, strength=$2); font: inherit;">' : '<span style="text-shadow: $1 1px 1px 1px">',
[12-Dec-2017 00:12:48 America/Argentina/Cordoba] PHP Notice: Undefined index: browser in /home/username/public_html/Sources/Subs.php on line 1269
'after' => $context['browser']['is_ie'] ? '</td></tr></table> ' : '</span>',
[12-Dec-2017 00:12:48 America/Argentina/Cordoba] PHP Notice: Undefined index: browser in /home/username/public_html/Sources/Subs.php on line 1561
'before' => $context['browser']['is_ie'] ? '<span style="display: inline-block; filter: Shadow(color=$1, direction=$2); height: 1.2em;">' : '<span style="text-shadow: $1 $2">',
[12-Dec-2017 00:12:48 America/Argentina/Cordoba] PHP Notice: Undefined index: browser in /home/username/public_html/Sources/Subs.php on line 1563
'validate' => $context['browser']['is_ie'] ? create_function('&$tag, &$data, $disabled', '
[12-Dec-2017 00:12:48 America/Argentina/Cordoba] PHP Notice: Undefined index: html_headers in /home/username/public_html/Sources/Subs-SimpleSpoiler.php on line 77
$context['html_headers'] .= '
[12-Dec-2017 00:12:48 America/Argentina/Cordoba] PHP Notice: Undefined index: server in /home/username/public_html/Sources/Subs.php on line 1800
$non_breaking_space = $context['utf8'] ? ($context['server']['complex_preg_chars'] ? '\x{A0}' : "\xC2\xA0") : '\xA0';
[12-Dec-2017 00:12:54 America/Argentina/Cordoba] PHP Notice: Undefined index: path in /home/username/public_html/Sources/Subs-Newsletter.php on line 118
$yt_arr = explode('/',$ytquery['path']);
[12-Dec-2017 00:12:55 America/Argentina/Cordoba] PHP Notice: Undefined index: server in /home/username/public_html/Sources/Subs-Post.php on line 656
$line_break = $context['server']['is_windows'] || !$use_sendmail ? "\r\n" : "\n";
[12-Dec-2017 00:12:55 America/Argentina/Cordoba] PHP Notice: Undefined index: character_set in /home/username/public_html/Sources/Subs-Post.php on line 1250
$charset = $custom_charset !== null ? $custom_charset : $context['character_set'];
[13-Dec-2017 03:01:45 America/Argentina/Cordoba] PHP Notice: Undefined index: utf8 in /home/username/public_html/Sources/Subs-Post.php on line 1293
if ($hotmail_fix && ($context['utf8'] || function_exists('iconv') || $context['character_set'] === 'ISO-8859-1'))
[13-Dec-2017 03:01:45 America/Argentina/Cordoba] PHP Notice: Undefined index: utf8 in /home/username/public_html/Sources/Subs-Post.php on line 1295
if (!$context['utf8'] && function_exists('iconv'))