Core NFC can not find NFTechnologyEvent

I created a sample application to scan different NFC tags with Core NFC. Unfortunately when it finds NDEF messages, I get this exception output:

2017-06-07 15:36:58.919005+0200 NFC[399:60159] <NSXPCConnection: 0x1c4114eb0> connection to service named com.apple.nfcd.service.corenfc: Warning: Exception caught during decoding of received message, dropping incoming message.
Exception: Exception while decoding argument 0 (#2 of invocation):
<NSInvocation: 0x1c047cd80>
return value: {v} void
target: {@} 0x0
selector: {:} didDetectExternalReader:
argument 2: {@} 0x0
Exception: decodeObjectForKey: class "NFTechnologyEvent" not loaded or does not exist

Has someone an idea what that means? It doesn't look like the 'normal' bugs in early betas, it seems to be some kind of linker error?
I have set the entitlement entry and the usage description. It's also activated in the app id and I'm using the correct provisioning profile.

Thanks in advance!