Magento 2.1 – UI Component Image Upload Form

I am trying to add an image field in my module. I know its been asked before, I tried many provided solutions but can't get it to work. Here's the error I am getting:

While editing old entity:

/pub/static/adminhtml/Magento/backend/en_US/Magento_Ui/js/form/element/file-uploader.js:69
Uncaught TypeError: value.map is not a function

While creating new entity, after selecting the uploadable file, I get this on console:

admin/namespace_module/entity_image/upload/key/dce7aaf794cabba38bc88c52a3317988b859ee4987303d9954ab92c91f9f9049?isAjax=true
500 (Internal Server Error)

On checking the url above:

Exception #0 (BadMethodCallException): Missing required argument
$baseTmpPath of Magento\Catalog\Model\ImageUploader.

My form.xml

<field name="image">
    <argument name="class" xsi:type="string">Namespace\Module\Model\Entity\DataProvider</argument>
    <argument name="data" xsi:type="array">
        <item name="config" xsi:type="array">
            <item name="dataType" xsi:type="string">string</item>
            <item name="source" xsi:type="string">Entity</item>
            <item name="label" xsi:type="string" translate="true">Image</item>
            <item name="visible" xsi:type="boolean">true</item>
            <item name="formElement" xsi:type="string">fileUploader</item>
            <item name="elementTmpl" xsi:type="string">ui/form/element/uploader/uploader</item>
            <item name="previewTmpl" xsi:type="string">Namespace_Module/image-preview</item>
            <item name="required" xsi:type="boolean">false</item>
            <item name="uploaderConfig" xsi:type="array">
                <item name="url" xsi:type="url" path="namespace_module/entity_image/upload"/>
            </item>
        </item>
    </argument>
</field>

My Upload Class:

namespace [Namespace]\[Module]\Controller\Adminhtml\[Entity]\Image;

use Magento\Framework\Controller\ResultFactory;

/**
 * Class Upload
 */
class Upload extends \Magento\Backend\App\Action
{
    /**
     * Image uploader
     *
     * @var \[Namespace]\[Module]\Model\ImageUploader
     */
    protected $imageUploader;

    /**
     * @param \Magento\Backend\App\Action\Context $context
     * @param \Magento\Catalog\Model\ImageUploader $imageUploader
     */
    public function __construct(
        \Magento\Backend\App\Action\Context $context,
        \Magento\Catalog\Model\ImageUploader $imageUploader
    ) {
        parent::__construct($context);
        $this->imageUploader = $imageUploader;
    }

    /**
     * Check admin permissions for this controller
     *
     * @return boolean
     */
    protected function _isAllowed()
    {
        return $this->_authorization->isAllowed('[Namespace]_[Module]::[entity]');
    }

    /**
     * Upload file controller action
     *
     * @return \Magento\Framework\Controller\ResultInterface
     */
    public function execute()
    {
        try {
            $result = $this->imageUploader->saveFileToTmpDir('image');

            $result['cookie'] = [
                'name' => $this->_getSession()->getName(),
                'value' => $this->_getSession()->getSessionId(),
                'lifetime' => $this->_getSession()->getCookieLifetime(),
                'path' => $this->_getSession()->getCookiePath(),
                'domain' => $this->_getSession()->getCookieDomain(),
            ];
        } catch (\Exception $e) {
            $result = ['error' => $e->getMessage(), 'errorcode' => $e->getCode()];
        }
        return $this->resultFactory->create(ResultFactory::TYPE_JSON)->setData($result);
    }
}

Is there something I am missing? Do I need to add/update anyother files?