title: Problems with presenting VC, the screen turns black
body: <p>I am trying to present VC after user is logged in. But after login is successful the VC turns black. Demonstration what happens is <a href="https://vimeo.com/222359186" rel="nofollow noreferrer">here</a> and there are same images. I have found articles here on stackoverflow but any of them did not help me.<a href="https://i.stack.imgur.com/ZQXIF.png" rel="nofollow noreferrer">enter image description here</a><a href="https://i.stack.imgur.com/cu2Ir.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/cu2Ir.png" alt="enter image description here"></a><a href="https://i.stack.imgur.com/IJEwd.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/IJEwd.png" alt="enter image description here"></a><a href="https://i.stack.imgur.com/1AsAr.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/1AsAr.png" alt="enter image description here"></a><a href="https://i.stack.imgur.com/Jjnoz.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Jjnoz.png" alt="enter image description here"></a></p>