Modpacks not working

[Livden05]

So whenever i try to launch some modpacks it closes the client and starts the game, but whenever the game is about to launch then the game it doesn't and the client launches again. but its not every mod, for exampel the midgard and ice and fire modpack dont work but the complex pixelmon works. does someone got a fix?

[tomplayzYT33]

if the mods arent for the correct version like a mod for 1.19.3 used on 1.7.3 will do that