cant launch minecraft

[BlueVixion]

i cant launch my minecraft, i launch it with modpacks mc eternal at twitch app, an error occured it said, i tried to repair the profile and it won't work, how can i fix it?

[Ugdhar]

1.12 is no longer supported due to age.

Please update to a modern version (1.14.4/1.15.2) to receive support.

 

More information on supported versions can be found in the LTS link at the top of every page.