Forge build error

[phentoGG]

i downloaded forge and buidled it but it says

 

 

 

* What went wrong:
A problem occurred configuring root project 'Forge Client'.
> Could not resolve all dependencies for configuration ':classpath'.
   > Could not resolve net.minecraftforge.gradle:ForgeGradle:2.1-SNAPSHOT.
     Required by:
         :Forge Client:unspecified
      > Could not resolve net.minecraftforge.gradle:ForgeGradle:2.1-SNAPSHOT.
         > Unable to load Maven meta-data from http://files.minecraftforge.net/maven/net/minecraftforge/gradle/ForgeGradle/2.1-SNAPSHOT/maven-metadata.xml.
            > Could not GET 'http://files.minecraftforge.net/maven/net/minecraftforge/gradle/ForgeGradle/2.1-SNAPSHOT/maven-metadata.xml'.
               > peer not authenticated
 

[phentoGG]

plz reply asap