minecraft wont start because of game output

I was pressing on the play button on minecraft launcher and i thought minecraft would open

But instead i came to a page on minecraft launcher saying Game Output(LeoIsak) and when i press play again nothing happends. i have tried redownloading minecraft several times and it doesent work.

It happened after i downloaded a mod called voidlauncher and i deleted that to.

I know that this isn't a bug but i couldn't find any other page to send in questions about launcher so if you can't help me please send a link of who can help me. Thanks!