kingxturner

I have let it through my firewall already and Minecraft vanilla too so I could fix the previous error but after I sorted the firewall this error came up

hi guys i keep having an error when i install a modpack, it has happened for attack on the b-team, voltz, tekkit classic, tekkit legends and a few others honestly i have tried hundreds of modpacks but it comes up with same error but different version titles. can anybody help???