I can't launch tekkit classic

[Cryptex101]

Title: I can't launch tekkit classic

Version: 3.1.2

OS: Idfk

Java Version: Recent

Description of Problem:

Everytime I try to launch my tekkit classic it won't launch and I keep getting an error message. My other mod packs work expect for my tekkit classic!

Error Messages:

When I click 'launch' it keeps saying "Could not find the main class: net.technicpack.legacywrapper.Launch. Program will exit"

Error Log:

[Bad_Monkey]

This helped me for hack/mine but not tekkit classic or yogbox. thanks anyway. edit- i later got all to work by re-downloading the launcher and setting it to the last stable build