After changing php version Laravel goes white screen

Hello there , I was having issue with sending mail and old php version was 5.6.30 ,I had project on diff server before with php 7.0.22 soI decided to migrate php to 7. After I can see only white screen .No Apache logs no Laravel logs .Storage has the right permissions. I did some debugging and code stops running here /public/index.php Code works here (I can see dd(1)) $response = $kernel->handle( $request = Illuminate\Http\Request::capture() ); it does not work anymore (dd(1)) .Please help