CakePHP: the rapid development php framework: Missing Controller

Warning (512): /home/janefever/shiphamcountryholidays.co.uk/app/tmp/cache/ is not writable [CORE/cake/libs/cache/file.php, line 262]

Code

        if (!$this->__active && $this->__init && !is_writable($this->settings['path'])) {
            $this->__init = false;
            trigger_error(sprintf(__('%s is not writable', true), $this->settings['path']), E_USER_WARNING);

FileEngine::__active() - CORE/cake/libs/cache/file.php, line 262
FileEngine::init() - CORE/cake/libs/cache/file.php, line 102
Cache::engine() - CORE/cake/libs/cache.php, line 163
Cache::config() - CORE/cake/libs/cache.php, line 131
include - APP/config/core.php, line 228
Configure::__loadBootstrap() - CORE/cake/libs/configure.php, line 616
Configure::getInstance() - CORE/cake/libs/configure.php, line 125
include - CORE/cake/bootstrap.php, line 45
[main] - APP/webroot/index.php, line 83

Missing Controller

Error: Availability.htmlController could not be found.

Error: Create the class Availability.htmlController below in file: app/controllers/availability.html_controller.php

<?php
class Availability.htmlController extends AppController {

	var $name = 'Availability.html';
}
?>

Notice: If you want to customize this error message, create app/views/errors/missing_controller.ctp