Minecraft forge failed to launch

I have a school project in Minecraft where I must create a computer in Minecraft. And for this, I need to install some forge mods. I tried installing the FTB (feed the beast) launcher but that gave me the error “authlib not enabled, check your firewall settings.” then I tried installing the at launcher, that gave me the infinitely suck in booting glitch. for both of these things, I tried many things. I tried disabling proxies, disabling network security, and even deleting and reinstalling java. none of this worked. so I tried just manually installing forge. I did that, the installation said it run successfully, then when I tried to boot it up, it gave me the “unexpected” error message. I am now lost and in seek of guidance. is there someone who can help?

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