Fix Gradle Script

build.gradle

@@ -46,7 +46,7 @@ allprojects {
     def buildNumber = ""
     def date = ""
     ext {
-        git = Grgit.open(dir: '.git')
+        git = Grgit.open(dir: new File(rootDir.toString()+'/.git'))
         date = git.head().getDate().format("yy.MM.dd")
         revision = "-${git.head().abbreviatedId}"
         parents = git.head().parentIds;
@@ -63,6 +63,7 @@ allprojects {
 
     version = String.format("%s.%s", rootVersion, buildNumber)
 }
+
 description = rootProject.name
 
 subprojects {
@@ -191,4 +192,4 @@ task aggregatedJavadocs(type: Javadoc, description: 'Generate javadocs from all
             includes += javadocTask.includes
         }
     }
-}
+}