Attempt to assign property "shortName" on null

[XFFA.IR Bot]

I have a finder; when i use:

Code:

$topicFinder = $this->finder('XFRM:Category');
$topicFinder
            ->where('resource_category_id', '1')
            ->fetch();

I get a result.

Now I do the same with mya table:

Code:

$topicFinder = $this->finder('Xencafe\News:News');
$topicFinder
            ->where('news_id', '1')
            ->fetch();

I get the error message:

Attempt to assign property "shortName" on null

I have checked everything ten and more times.
I have a table, I have...

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