[1.6.4] Forge Enviroment failed hash

[Dmitchell94]

Hey guys recently reformatted my computer and was just setting my forge environment back up today. got java installed and the path set eclipse set and downloaded forge src for 1.6.4 but when i ran the install this error message was displayed:

 

Download of minecraft_server.1.6.4.jar failed hash check, deleting abcf286a14f7a
ee82e8bf89270433509 ba3145656b1480122bd8759cecd7b7a1
Something failed verifying minecraft files

 

any idea what could be causing this problem and how i could fix it?

[Dmitchell94]

9.11.1.965 was the version I was using.

 

Also what is this new Gradle thing?