I am just starting modding, and was trying to set up a forge environment. I did everything exactly as specified in the guide, and tried several tutorials. Every time when I started Eclipse(and I did check that I was in the right work-space), the Minecraft project had following 2 errors
Archive for required library:'lib/scala-library.jar' in project 'Minecraft' cannot be read or is not a valid ZIP file
The project cannot be built until the build path errors are resolved
I downloaded scala and copied the specified jar with no change.
The src folder in the project is empty, and when I attempted to add a new package it disappeared from the package explorer.
[edit]: I had to run the decompile.bat in addition to the install.cmd.