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PHP Finding and Using Packages

When I attempt to create the email with the javascript in the message, I get a permissions error for HTMLPurifier.

When creating an email that includes javascript with the WYSIWYG editor, I receive the following error:

Warning: Directory /home/treehouse/workspace/vendor/ezyang/htmlpurifier/library/HTMLPurifier/DefinitionCache/Serializer not writable, please chmod to 775 in /home/treehouse/workspace/vendor/ezyang/htmlpurifier/library/HTMLPurifier/DefinitionCache/Serializer.php on line 297

Warning: Directory /home/treehouse/workspace/vendor/ezyang/htmlpurifier/library/HTMLPurifier/DefinitionCache/Serializer not writable, please chmod to 775 in /home/treehouse/workspace/vendor/ezyang/htmlpurifier/library/HTMLPurifier/DefinitionCache/Serializer.php on line 297

Warning: Directory /home/treehouse/workspace/vendor/ezyang/htmlpurifier/library/HTMLPurifier/DefinitionCache/Serializer not writable, please chmod to 775 in /home/treehouse/workspace/vendor/ezyang/htmlpurifier/library/HTMLPurifier/DefinitionCache/Serializer.php on line 297