LInkModelToNode throw exception

[codicezerouno]

Hello,
I generate classes with UAModeler and I'm trying to bind an instance of a generated Model class to the respective object node.

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LinkModelToNode(nodeId, objInstance, null, null, 500);

I got this exception:

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System.ArgumentNullException: Il valore non può essere null.
Nome parametro: key
   in System.Collections.Generic.Dictionary`2.Insert(TKey key, TValue value, Boolean add)
   in System.Collections.Generic.Dictionary`2.set_Item(TKey key, TValue value)
   in UnifiedAutomation.UaServer.BaseNodeManager.LinkModelToNode(NodeId rootId, Object instance, Object syncLock, IModelMapper mapper, Double minimumSamplingInterval)
   in BA.BANodeManager.Startup() in 

Where could I be wrong?

[codicezerouno]

Hi, I found what is causing the issue: I was creating NodeId by using numeric identifier. Using string identifier solved the error.
Thanks