For my next project we’ll use Event Sourcing. Therefore I’m spending some free time in looking at NEventStore , a persistence agnostic Event Store for .NET. One of the features of NEventStore is a built-in PollingClient allowing you to poll the Event Store for the latest commits. However when I tried to test the PollingClient nothing happened?! Here is the code I was using: No exception was thrown, however when I browsed through the Output window in Visual Studio I noticed the following message: A first chance exception of type 'Newtonsoft.Json.JsonSerializationException' occurred in NEventStore.dll It seems that the PollingClient immediatelly tries to deserialize the committed events, as I didn’t include a reference to the assembly containing the Events, the deserializer (silently) fails. To fix it, the only thing I had to do was adding a reference to my Events assembly.