Lync 2013 Forest Preparation Error: Object reference not set to an instance of an object

If you’re installing Lync 2013 and you got following error on Forest Preparation steps.

Error: Object reference not set to an instance of an object

▼ Details

└ Type: NullReferenceException

└ ▼ Stack Trace

└ at

Microsoft.Rtc.Management.Deployment.LcForest.SetupGroupKey(SharedSecretKey

groupKey, String ownerGroup, IEnumerable`1 readerGroups, String preferredDC)

at Microsoft.Rtc.Management.Deployment.LcForest.PrepareForest()
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To Solve Problem: Open Lync Management Shell and Type following;

Enable-CsAdForest -GroupDomain domain.local -GroupDomainController dc.domain.local -GlobalCatalog dc.domain.local

(dc.domain.local = your company’s top domain controller)