Feed The Beast

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using the FTB launcher, clicking on "edit modpack" button, disabling blood magic, blood arsenal, deep resonance, embers and roots takes me to a minecraft windows with a lot of symbols i can't read and 2 buttons: one takes me to the mod folder, the other one takes me to java console.
No other options... only thing i can do is close the window and the game closes.
Is it possible to disable a mod?
Do i need to do anything else?

thanks in avance.
PD: tried as well on twitch launcher, unlocking the profile and deselecting the mods crash the game.