Locally site works perfectly. Problem start appear as i upload it to online server.
And: whoops something went wrong - is common laravel phrase, whenever smth goes wrong.)
Anyway thanks for your attention. I found the way to deal with the problems Im facing.
And will test asgard further so if problem will occur once again, i ll write back.
Well in case anyone else sees this error I solved it by uninstalling PHP7 (even though that is current stable version) and reinstalling PHP 5.6. Everything works fine now. Must be composer is not working well with PHP7 or you have to setup differently now.