add print

gradle/app-version.gradle

@@ -25,6 +25,7 @@ tasks.withType(JavaCompile) {
       versionFile.write(groovy.json.JsonOutput.prettyPrint(json))
     } catch (Exception e) {
       println("Failed to create version file. Writing blank file.")
+      println(e)
       versionFile.write('{}')
     }
   }