Let's try this...

build.gradle

@@ -50,7 +50,7 @@ dependencies {
     //compile name: 'ForgeMultipart', version: "${config.minecraft_version}-${config.fmp_version}", ext: 'jar'
 }
 
-group = "com.github.glitchfiend.biomesoplenty"
+group = com.github.glitchfiend.biomesoplenty
 version = config.mod_version
 archivesBaseName = "BiomesOPlenty"
 
@@ -213,4 +213,4 @@ uploadArchives {
             }
         }
     }
-}
+}