Packaging Bluprint based project not launching

Hi! I’m using 4.23 at the moment. After few weeks of playing around with my blueprint I’ve managed to get smth working. So naturally i tried to build it and launch my project as standalone packaged build. And… to my surprise pacakaging/coocking doesn’t even start - it just redeirects me ta an url with UE4 documantation. No errors, no messages - just a browser page. I thought it might be because I’ve tried using niagara, but removing assests and unchecking plugin changes nothing. Any ideas? Is it based on UE4 version? What am I missing?