#Lync 2013 - Object reference not set to an instance of an object

Lync 2013 Prepare Forest failed.

Error:

Resolution:

Run the following parameter in Lync power shell management.

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

OR

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