I am 100% sure you are trying to install forge 1.14.4 - 28.0.1 and that's why it's crashing, I have same issue but just to be sure I removed all mods for clear 1.14.4 forge.
This is to be expected for first 1.14.4 forge version
The actual error is here: https://gist.github.com/arturek1666/ba731e83f3fea44e2b439eb495b217d9