Magento 2 - custom admin menu > access denied

Question

i have this controller
News\LatestNews\Controller\Adminhtml\News.php

and if i comment this

protected function _isAllowed()
{

   // return $this->_authorization->isAllowed('News_LatestNews::manage_news');

}

the page shows access denied, but If turn it on,

it shows this error

1 exception(s):
Exception #0 (InvalidArgumentException): Boolean value is expected, supported values: array (
  0 => true,
  1 => 1,
  2 => 'true',
  3 => '1',
  4 => false,
  5 => 0,
  6 => 'false',
  7 => '0',
)

what is the problem? how can i fix this?

newBieInMagentohere

Answer 1

Check for correct XML. Take a look for line breaks in values like

<element> \n true </element>

In my case it was a copy'n'paste fail :D

Answer 2

For people who came here from google - one of your config node has

 xsi:type="boolean"

But it's value is different, eg:

<item name="something" xsi:type="boolean">some_string_instead_boolean</item>