Weird problem

Hello, me and my friend are trying to run a modded server using forge. But something keeps happening, when he clicks the server it should add folder named mods and another folder named logs. But in his case, nothing happenes, we know the problem is on his side, but we don't know what to do. (He tried more versions not just one, but when he clicks the normal non modded server it works)

I hope you understand, good night.