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A PHP Error was encountered

Severity: Notice

Message: Undefined index: userid

Filename: views/question.php

Line Number: 187


File: /home/prodcxja/public_html/questions/application/views/question.php
Line: 187
Function: _error_handler

File: /home/prodcxja/public_html/questions/application/controllers/Questions.php
Line: 433
Function: view

File: /home/prodcxja/public_html/questions/index.php
Line: 315
Function: require_once

name Punditsdkoslkdosdkoskdo

PHP 7 DomDocument not found

I try run command: app/console cache:clear

This return me error:

An error occurred when executing the "'cache:clear --no-warmup'" command:
PHP Fatal error: Uncaught Symfony\Component\Debug\Exception\FatalThrowable
Error: Fatal error: Class 'DOMDocument' not found in /var/www/html/vendor/s

Ubuntu 14.04 LTS I use PHP 7 and install php5-dom not resolved my problem: sudo apt-get install php5-dom