This is my cron
<style>
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.ow_debug_cap{font:bold 13px Tahoma;color:#fff;padding:5px;border:1px solid #000;width:250px;margin-top:-20px;}
.ow_debug_body .notice{background:#fdf403;color:#555;}
.ow_debug_body .warning{background:#f8b423;color:#555;}
.ow_debug_body .error{background:#c10505;color:#fff;}
.ow_debug_body .exception{background:#093dd3;color:#fff;}
.ow_debug_body .vardump{background:#333;color:#fff;}
.vardumper .string{color:green}
.vardumper .null{color:blue}
.vardumper .array{color:blue}
.vardumper .bool{color:blue}
.vardumper .property{color:brown}
.vardumper .number{color:red}
.vardumper .class{color:black;}
.vardumper .class_prop{color:brown;}
</style>
<div class="ow_debug_cont">
<div class="ow_debug_body">
<div class="ow_debug_cap exception">OW Debug - Exception</div>
<table>
<tr>
<td class="lbl">Message:</td>
<td class="cnt">Invalid argument `$subject`</td>
</tr>
<tr>
<td class="lbl">File:</td>
<td class="cnt">/home/kuzbbjvq/public_html/ow_system_plugins/base/classes/mail.php</td>
</tr>
<tr>
<td class="lbl">Line:</td>
<td class="cnt">119</td>
</tr>
<tr>
<td class="lbl">Trace:</td>
<td class="cnt"><pre>#0 /home/kuzbbjvq/public_html/ow_plugins/notifications/bol/service.php(278): BASE_CLASS_Mail->setSubject('')
#1 /home/kuzbbjvq/public_html/ow_plugins/notifications/bol/service.php(251): NOTIFICATIONS_BOL_Service->sendProcess('1', Object(NOTIFICATIONS_CMP_Notification))
#2 /home/kuzbbjvq/public_html/ow_plugins/notifications/cron.php(94): NOTIFICATIONS_BOL_Service->sendNotifications('1', Array, true)
#3 /home/kuzbbjvq/public_html/ow_cron/run.php(75): NOTIFICATIONS_Cron->run()
#4 {main}</pre></td>
</tr>
<tr>
<td class="lbl">Type:</td>
<td class="cnt" style="color:red;">InvalidArgumentException</td>
</tr>
</table>
</div>
</div>