Error merging two GPOs (4361638)

User getting the below error while merging two GPOs'

Full error:

System.AggregateException: One or more errors occurred. ---> System.ServiceModel.FaultException`1[Quest.Avalanche.Exceptions.AvalancheActionException]: The creator of this fault did not specify a Reason. Server stack trace: at System.ServiceModel.Channels.ServiceChannel.HandleReply(ProxyOperationRuntime operation, ProxyRpc& rpc) at System.ServiceModel.Channels.ServiceChannel.Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object[] ins, Object[] outs, TimeSpan timeout) at System.ServiceModel.Channels.ServiceChannelProxy.InvokeService(IMethodCallMessage methodCall, ProxyOperationRuntime operation) at System.ServiceModel.Channels.ServiceChannelProxy.Invoke(IMessage message) Exception rethrown at [0]: at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg) at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type) at Quest.Avalanche.Interfaces.IVersionControlManagerStream.GetRegistrySettingData(VersionControlledData versionControlledData) at Quest.Avalanche.Interfaces.ServiceInterfaces.GetRegistrySettingData(VersionControlledData versionControlledData) at Quest.Avalanche.SnapIn.Base.BasePolicyMergeAction.b__0() at System.Threading.Tasks.Task.Execute() --- End of inner exception stack trace --- at System.Threading.Tasks.Task.ThrowIfExceptiona