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Directory .../Serializer not writable, please chmod to 777 in ../Serializer.php

Posted by A. 

Hello, I am getting these errors in my error_log every time I try to access pages where it uses htmlpurifier.

Directory /var/www/html/classes/library/HTMLPurifier/DefinitionCache/Serializer not writable, please chmod to 777 in /var/www/html/classes/library/HTMLPurifier/DefinitionCache/Serializer.php on line 292

What exactly is the purpose of this file, and I've read other places that it's bad practice to chmod to 777.

Any help on what I should do, or if anyone have same problem?

I'm on Ubuntu 16.04 with Apache2 + PHP7.0

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HTML input is enabled. Make sure you escape all HTML and angled brackets with < and >.

Auto-paragraphing is enabled. Double newlines will be converted to paragraphs; for single newlines, use the pre tag.

Allowed tags: a, abbr, acronym, b, blockquote, caption, cite, code, dd, del, dfn, div, dl, dt, em, i, ins, kbd, li, ol, p, pre, s, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, var.

For inputting literal code such as HTML and PHP for display, use CDATA tags to auto-escape your angled brackets, and pre to preserve newlines:

Place code here

Power users, you can hide this notice with:

.htmlpurifier-help {display:none;}