About two hours ago I was playing minecraft with forge version 1.11-13.19.0.2148 just fine.  Then, one hour ago, I decided to update forge.  I actually installed three versions:

1.11-13.19.1.2189

1.11.2-13.20.0.2205

1.11.2-13.20.0.2206

 

Now minecraft won't launch, and throws exactly one error:

 

 

[23:07:24 WARN]: Couldn't download https://libraries.minecraft.net/com/mojang/authlib/1.5.24/authlib-1.5.24.jar for job 'Version & Libraries'

java.lang.RuntimeException: Hash did not match downloaded file (Expected 35de5b76f383fbd1d4482d257c43fbba713a6cff, downloaded 0889ff5477b844800cff734babbf42c1bbda4b10)

 

 

 

Interestingly enough, it launches fine without forge, and it even launches fine with forge version 1.8.9-11.15.1.1722.  However, it won't launch for both the version I was using and the versions I installed today.

 

Any ideas?

Did a clean reinstall of minecraft and now everything works fine.